Stable capabilities
Ordered by level: primitives at the bottom of the graph, workflows at the top. Each one carries its own tests, at least 8 per function.
Suites — the capabilities a kind of app is built from: accounting, payroll, an online shop, a clinic…
Collection: React form elements — accessible form components for React, and the pure helpers they use.
Level 0 primitive
encoding.base64
Bytes to base64 and base64url text and back (RFC 4648), with strict decoding, identically in every language.
A group of 4:
base64_encode, base64_decode, base64_url_encode, base64_url_decode
encoding.hex
Bytes to lowercase hexadecimal text and back (RFC 4648 base16), strictly, identically in every language.
A group of 2:
hex_encode, hex_decode
math.exp
e to the power x from + - * / only, so TypeScript, Python and Rust return the same double for the same input.
exp in Python
math.integer-sqrt
Exact integer square root: the largest whole number whose square does not exceed n.
integer_sqrt in Python
math.round-float
Round a float half away from zero to 0-12 decimal places, identically in TypeScript, Python and Rust.
round_float in Python
validation.vin
Check a 17-character vehicle identification number and its check digit; enforced for North American VINs.
validate_vin in Python
encoding.utf8
Text to UTF-8 bytes and strictly back (RFC 3629), so hashing and signing see the same bytes in every language.
A group of 2:
utf8_encode, utf8_decode
geo.point-in-polygon
Whether a latitude/longitude point lies inside a polygon (ray casting; the boundary counts as inside).
point_in_polygon in Python
math.big-integer
Exact integer arithmetic of any size, on decimal strings, for powers and products that overflow 64 bits.
calculate_big_integer in Python
math.pow
base to the power exponent from + - * / only, exact by squaring for whole exponents, identical in every language.
pow in Python
math.sin-cos
Sine and cosine of an angle in radians from + - * / only, so every language returns the same doubles.
sin_cos in Python
validation.bic
Check the format of a SWIFT/BIC code (8 or 11 characters) and split it into its parts.
validate_bic in Python
validation.lei
Check a 20-character Legal Entity Identifier against its ISO 17442 / ISO 7064 MOD 97-10 check digits.
validate_lei in Python
charts.contrast
WCAG 2.x contrast ratio between two colours, and which text colour reads best on a background.
A group of 2:
contrast_ratio, readable_text_color
crypto.hmac-sha256
HMAC-SHA256 of a message under a secret key (RFC 2104, RFC 4231), in pure code that also runs in the browser.
hmac_sha256 in Python
dates.day-of-week
The ISO 8601 day of the week for a date: 1 is Monday through 7 is Sunday.
day_of_week in Python
dates.days-between
Calendar days from one ISO date to another, signed: negative when the second date is earlier.
days_between in Python
dates.quarter
Calendar quarter and fiscal quarter of a date, with the fiscal year and quarter date ranges, for any start month.
quarter in Python
education.academic-year
The academic year and term a date falls in: 1 September to 31 August by default, terms from the caller.
academic_year in Python
geo.distance
Great-circle distance in metres between two latitude/longitude points (haversine), to the millimetre.
distance in Python
math.basis-points
Convert a rate between percent, basis points and a plain ratio exactly, as decimal text or integer basis points.
A group of 3:
convert_rate, to_basis_points, from_basis_points
math.round-div
Integer division with an explicit rounding mode, for money arithmetic that must not drift.
round_div in Python
money.currency-digits
How many decimal places a currency's minor unit has, from the ISO 4217 list.
currency_digits in Python
text.mask
Mask all but the last n characters of a card, account or phone number, optionally keeping separators.
mask in Python
charts.color
Hex colours to RGB and back, and sRGB channels to linear light and back, identically in every language.
A group of 4:
parse_hex, to_hex, srgb_to_linear, linear_to_srgb
charts.extent
The minimum and maximum of a series as [min, max], skipping gaps (null), or null when there is no value.
extent in Python
collections.chunk
Split a list into consecutive batches of at most n items, in order; the last batch may be short.
chunk in Python
crypto.constant-time-equal
Compare two byte strings in time that does not depend on where they differ, for checking MACs and hashes.
constant_time_equal in Python
crypto.pbkdf2-sha256
PBKDF2 with HMAC-SHA256 (RFC 8018): derive a key from a password and salt, slowly, fast enough for a login request.
pbkdf2_sha256 in Python
crypto.sha256
The SHA-256 digest of a byte string (FIPS 180-4), in pure code that also runs in the browser.
sha256 in Python
dates.add-days
Shift an ISO date by a whole number of days, forwards or backwards, with exact calendar arithmetic.
add_days in Python
dates.add-months
Add calendar months to an ISO date, clamping to the month end: 31 Jan + 1 month is 28 or 29 Feb.
add_months in Python
dates.is-leap-year
Whether a year is a Gregorian leap year: every 4th, except centuries, except every 400th.
is_leap_year in Python
dates.overlap
Days two date ranges have in common, with the end of each range stated as inclusive or exclusive.
overlap_days in Python
dates.week-number
ISO 8601 week number and week-numbering year of a date: weeks start Monday, week 1 holds the first Thursday.
week_number in PythonLevel 1 generic concept
agri.field-area
Field area in square metres, hectares and acres from a boundary polygon of latitude/longitude points.
field_area in Python
money.split-even
Split an amount into n near-equal parts that add back up to exactly the whole.
split_even in Python
net.ipv4
Parse, format and check dotted-quad IPv4 addresses, refusing leading zeros, octal, hex and short forms.
A group of 3:
parse_ipv4, format_ipv4, is_ipv4
stats.moving-average
Simple or exponential moving average over a series, one value per full window, rounded to stated decimals.
moving_average in Python
charts.downsample
Reduce a long series to a few points that keep its visual shape, by Largest-Triangle-Three-Buckets (LTTB).
downsample in Python
collections.sort-by
Stably sort records by one key, ascending or descending, with a total order across mixed types.
sort_by in Python
dates.age
Age in whole years on a given date, with 29 February birthdays ageing on 1 March in other years.
age in Python
money.compare
Compare two amounts of one currency, refusing to compare across currencies; min, max and clamp too.
A group of 4:
compare_money, min_money, max_money, clamp_money
monitor.rollup
Aggregate a metric series into fixed time buckets (count, min, max, avg, sum, last), empty buckets included.
rollup in Python
monitor.uptime
Time-weighted uptime of a target over a window from its checks, with gaps longer than a limit counted as unknown.
uptime in Python
net.ipv6
Parse IPv6 addresses and write them in RFC 5952 canonical form: lower-case, zeros compressed, IPv4 embedded.
A group of 3:
parse_ipv6, format_ipv6, is_ipv6
professional.utilisation
Billable utilisation and billing, collection and overall realisation rates, in basis points.
utilisation_rates in Python
react.form.form-field React ^19 · TypeScript only
Wire a label, hint and error message to one form control by id, the accessible way (GOV.UK form group pattern).
Not available in Python
auth.jwt
Sign, verify and decode HS256 JSON Web Tokens (RFC 7519): signature, algorithm and exp/nbf/iat checked with leeway.
A group of 3:
sign_jwt, verify_jwt, decode_jwt
charity.regular-giving-schedule
Collection dates for a regular gift: monthly, quarterly or annual on a day, clamped to short months, after a lead time.
regular_giving_schedule in Python
charts.palette
A categorical palette of n colour-blind-safe colours for chart series: Okabe-Ito or Paul Tol's bright scheme.
palette in Python
collections.diff
Compare two lists of records by key: which were added, which removed, and which changed and in what fields.
diff_by_key in Python
energy.meter-advance
Units consumed between two meter reads, counting the meter rolling over past all nines once.
meter_advance in Python
finance.ledger.journal-validate
Check a double-entry journal: debits equal credits, no zero or two-sided lines, one currency, well-formed account codes.
validate_journal in Python
fleet.ev-charging-cost
Cost of an electric vehicle charge from the energy added, charger efficiency and power, and time-of-use tariff windows.
ev_charging_cost in Python
inventory.eoq
Economic order quantity (Harris/Wilson): the order size that minimises ordering plus holding cost, in whole units.
economic_order_quantity in Python
monitor.error-budget
How much of an SLO's error budget is allowed, used and left, from good and bad event counts or seconds.
error_budget in Python
react.form.button React ^19 · TypeScript only
A form button in primary, secondary or warning style that stays focusable while loading (GOV.UK button).
Not available in Python
react.form.checkbox-group React ^19 · TypeScript only
A question answered by ticking any of several checkboxes, with item hints and an exclusive "None" (GOV.UK checkboxes).
Not available in Python
retail.coupon-validate
Check a coupon against a basket: dates, usage limits, eligible products and minimum spend, with reason codes.
validate_coupon in Python
retail.volumetric-weight
Chargeable parcel weight: the greater of actual and volumetric (dimensional) weight, rounded up to a billing step.
chargeable_weight in Python
validation.email
Is this a plausible email address? A documented, pragmatic subset of RFC 5322, not the full grammar.
is_email in Python
agri.yield-per-hectare
Crop yield per hectare and per acre from harvested quantity and field area in any area unit, exactly, as decimal text.
yield_per_hectare in Python
charity.donation-matching
Employer match on a donation: a ratio in basis points, limited by a per-donor cap and a programme budget.
donation_match in Python
charity.gift-aid-eligibility
Whether a UK donation qualifies for Gift Aid: declaration, enough tax paid, and the donor benefit limits.
gift_aid_eligibility in Python
charts.format
Axis and label text for charts: tick numbers, SI prefixes (1.2k, 3.4M), percentages, dates and money.
A group of 5:
format_tick, format_si, format_percent, format_date, format_money_tick
charts.histogram-bins
Bin values into histogram bins on round edges, by Sturges' rule, Freedman-Diaconis, or a fixed width.
histogram_bins in Python
charts.interpolate-color
The colour at a point along a sequential or diverging ramp, mixed in OKLab so steps look even; hex in, hex out.
interpolate_color in Python
collections.dedupe-by-key
Remove records that share a key value, keeping the first or the last of each, in input order.
dedupe_by_key in Python
energy.carbon-emissions
kgCO2e from kWh or litres of a fuel, using the UK government GHG conversion factors for the year.
carbon_emissions in Python
energy.degree-days
Heating and cooling degree days from daily mean temperatures and a base temperature, exact to 0.1.
degree_days in Python
fleet.cost-per-mile
Whole-life cost per mile of a vehicle, in tenths of a penny, from depreciation, fuel, maintenance, insurance and tax.
cost_per_mile in Python
fleet.fuel-cost
Fuel cost of a trip from distance, fuel economy (UK or US mpg, or L/100km) and price per litre, exactly.
fuel_cost in Python
hr.absence-bradford-factor
Bradford factor for a set of absence spells: spells squared times total days, which weights frequent short absences.
bradford_factor in Python
inventory.reorder-point
Reorder point: demand over the supplier lead time, rounded up to whole units, plus safety stock.
reorder_point in Python
inventory.stock-turnover
Stock turnover ratio, days inventory outstanding and days of cover for a period, computed exactly.
stock_turnover in Python
manufacturing.batch-size
Economic batch quantity: the EOQ for a batch made at a finite production rate, in whole units.
economic_batch_quantity in Python
money.parse
Parse "£1,234.50" or "1.234,50 €" into integer minor units, strictly: no guessing, no rounding.
parse_money in Python
react.form.styles React ^19 · TypeScript only
An optional stylesheet for the react.form elements' caps-* classes, themed by --caps-form-* custom properties.
Not available in Python
retail.gift-card-balance
Apply a payment from a gift card, redeeming part of the balance or all of it, and say what is still due.
redeem_gift_card in Python
units.convert
Convert length, mass, area, volume, temperature and energy between units, exactly, as decimal text.
convert_units in Python
validation.uk-sort-code-account
Check a UK sort code and account number with the Vocalink/Pay.UK modulus rules, against a table you supply.
validate_uk_sort_code_account in Python
agri.growing-degree-days
Growing degree days (thermal time) from daily min/max temperatures, a base and an optional upper cap.
growing_degree_days in Python
agri.seed-rate
Seed rate in kg/ha from target plants per m², thousand-grain weight and expected establishment.
seed_rate in Python
agri.stocking-rate
Stocking rate: livestock units and LU per hectare from animal numbers, by a published LU coefficient table.
stocking_rate in Python
auth.bearer-token
The token from an HTTP Authorization header of the form "Bearer <token>" (RFC 6750), or null if it has none.
parse_bearer_token in Python
auth.normalise-email
Trim an email address and lower-case its domain for storage and lookup, or null if it is not a plausible address.
normalise_email in Python
banking.faster-payments-limit
Whether a Faster Payment fits the scheme maximum, the bank's per-payment limit and what is left of its daily limit.
faster_payments_check in Python
banking.savings-aer
AER (annual equivalent rate) from a gross nominal rate and how often interest is paid, to two decimal places.
savings_aer in Python
charity.fundraising-ratio
Cost to raise £1 and charitable spend ratio for a charity, in exact basis points.
fundraising_ratios in Python
charts.scale
Map data values onto screen positions and back: linear, log, time, band and point scales, and nice domains.
A group of 7:
linear_scale, invert_linear, nice_domain, log_scale, time_scale, band_scale, point_scale
charts.ticks
Axis ticks: a round step (1, 2 or 5 x 10^k), the ticks on it, and calendar ticks from days to years.
A group of 4:
tick_step, nice_ticks, time_tick_interval, time_ticks
collections.group-by-key
Group records by the value at one key, preserving input order inside each group.
group_by_key in Python
collections.paginate
Slice a list into a 1-based page and report the totals an API response needs.
paginate in Python
collections.search-text
Filter records by a case-insensitive substring match across named fields, in input order.
search_text in Python
construction.brick-count
Bricks and mortar for a wall, openings subtracted, for UK standard 215 x 102.5 x 65 mm bricks with 10 mm joints.
brick_count in Python
construction.concrete-volume
Concrete for slabs, strip footings, pads and round columns: volume to the litre and an order rounded up to 0.1 m³.
concrete_volume in Python
construction.materials-area
Packs of tiles, paint, plasterboard or flooring to cover an area, with waste and coats, rounded up to whole packs.
materials_area in Python
construction.roof-pitch
Roof pitch in degrees, rafter length and roof slope area from span, rise and length.
roof_pitch in Python
construction.timber-length
Cutting list: which stock lengths to buy and which pieces to cut from each, allowing for saw kerf.
timber_cutting_list in Python
dates.add-business-days
Move a date forward or back by working days, skipping weekends and a caller-supplied holiday list.
add_business_days in Python
dates.bank-holidays
UK bank and public holidays for a region and year, as published by gov.uk, including one-off holidays.
bank_holidays in Python
dates.business-days-between
Working days between two dates, excluding weekends and a caller-supplied holiday list.
business_days_between in Python
dates.day-count-fraction
Year fraction between two dates by ACT/365F, ACT/360, 30/360, 30E/360 or ACT/ACT ISDA, as an exact fraction.
day_count_fraction in Python
dates.month-boundaries
The first day, last day and length of the calendar month containing a date.
month_boundaries in Python
dates.recurrence
The next n dates of a repeating rule: monthly on a day, last weekday of the month, every k days or weeks, yearly.
recurrence in Python
education.attendance-rate
Pupil attendance and absence rates in basis points, with the DfE persistent and severe absence flags.
attendance_rate in Python
education.cpd-hours
CPD logged against a requirement for a rolling or fixed period: minutes counted, shortfall and days left.
cpd_hours in Python
education.degree-classification
UK honours degree class (First, 2:1, 2:2, Third) from module marks and credits, weighted by level.
degree_classification in Python
education.gpa
Grade point average on a 4.0 scale from letter grades and credit hours, weighted by credits and rounded once.
gpa in Python
education.grade-boundaries
Grade for a mark from the caller's boundary table: inclusive lower bounds, ungraded below the lowest.
grade_for_mark in Python
education.school-year-group
School year group from date of birth on a date, by UK nation: Reception to Year 13, P1 to S6, P1 to Year 14.
school_year_group in Python
energy.gas-kwh
Convert gas meter units (cubic metres or hundreds of cubic feet) to kWh with the calorific value and 1.02264 correction.
gas_kwh in PythonLevel 2 domain function
hospitality.bill-split
Split a restaurant bill evenly, by item or by share, exactly to the penny, with the service charge shared in proportion.
bill_split in Python
finance.proration
Split an amount into the part used and the part unused over a billing period, losing nothing.
prorate in Python
validation.uk-postcode
Validate a UK postcode and normalise it to canonical upper case with one space before the inward code.
validate_uk_postcode in Python
agri.fertiliser-application
Fertiliser product rate (kg/ha and total) to meet N, P2O5 and K2O targets from its analysis, limiting nutrient first.
fertiliser_application in Python
monitor.mttr
MTTR, MTBF, downtime and incident counts for a reporting window, from a list of incidents.
reliability_stats in Python
charts.stack
Stack several series for stacked bars and areas: on zero, normalised to 100%, or diverging around zero.
stack in Python
construction.retention
Retention held and released on a construction valuation: full rate, half at practical completion, none at the end.
retention in Python
education.timetable-clash
Find timetable clashes: overlapping sessions that share a room, a teacher or a student group, in a fixed order.
timetable_clashes in Python
fleet.mileage-allowance
HMRC approved mileage allowance payments for an employee's own vehicle: tax-free amount, taxable excess or relief.
mileage_allowance in Python
telecoms.call-rating
Rate a call from a rate deck: longest-prefix destination match, billing increments, connection fee and minimum charge.
rate_call in Python
agri.gross-margin
Enterprise gross margin (output less variable costs), in total and per hectare or per head, in exact money.
gross_margin in Python
banking.fees-cap
Apply a monthly fee cap to a list of account charges: charge up to the cap, waive the rest.
apply_fee_cap in Python
dates.uk-tax-year
The UK personal tax year containing a date: 6 April to 5 April, with HMRC's label.
uk_tax_year in Python
energy.estimate-read
Estimate a meter read for a date from the average daily consumption between two earlier reads, with rollover.
estimate_read in Python
energy.tariff-time-of-use
Cost half-hourly consumption against time-of-use rates: Economy 7 windows or Agile-style half-hourly prices.
time_of_use_cost in Python
finance.fx-revaluation
Unrealised foreign exchange gain or loss on foreign-currency balances revalued at a period-end rate.
fx_revaluation in Python
finance.uk-bank-rate
Bank of England Bank Rate (base rate) in force on a date, from the Bank's official history since 2001.
uk_bank_rate in Python
hospitality.gross-profit-menu
Menu gross profit (GP%) on the VAT-exclusive price, and the menu price that reaches a target GP.
A group of 2:
menu_gross_profit, menu_price_for_gp
hospitality.recipe-cost
Cost a recipe and each portion from ingredient quantities, pack sizes and pack prices, allowing for trim and waste.
recipe_cost in Python
logistics.freight-rate
Freight charge from a carrier's dated weight-break tariff for a zone, with the fuel surcharge in force on the ship date.
freight_rate in Python
retail.loyalty-points
Loyalty points for a purchase: redeem in blocks, earn on what is paid, with tier multipliers.
loyalty_points in Python
todo.due-label
The short English label shown next to a todo: "2 days overdue", "Due today", "Due tomorrow", "Due Fri 2 Oct".
due_label in Python
agri.feed-ration
Ration costing and dry matter intake from each feed's fresh weight, DM % and price per tonne, in exact money.
feed_ration in Python
auth.access-token
Issue an API's HS256 access token, read one from an Authorization header, and refuse revoked or superseded ones.
A group of 3:
issue_access_token, read_access_token, confirm_access_token
banking.cheque-amount-words
The words and figures to write on a cheque: "One hundred and twenty pounds and fifty pence only", "£120.50".
cheque_amount_words in Python
banking.overdraft-interest
Overdraft interest for a statement period from daily balances, with an interest-free buffer.
overdraft_interest in Python
charity.gasds
Gift Aid Small Donations Scheme top-up for a tax year: the £8,000 limit, the matching rule and community buildings.
gasds in Python
charity.gift-aid
Gift Aid a UK charity can claim on a donation: basic rate tax grossed up, 25p per £1 at 20%.
gift_aid in Python
charity.higher-rate-relief
A Gift Aid donor's extra tax relief at higher, intermediate, additional and top rates, by extending the tax bands.
higher_rate_relief in Python
charts.shape
SVG path strings for lines, areas, steps, monotone curves, bars, arcs and pie slices, identical in every language.
A group of 7:
line_path, area_path, step_path, monotone_curve, bar_rects, arc_path, pie_angles
construction.cis-deduction
Construction Industry Scheme deduction (0, 20 or 30%) on the labour part of a subcontractor payment.
cis_deduction in Python
construction.vat-reverse-charge
Whether the UK VAT domestic reverse charge applies to a construction supply, and the invoice wording.
domestic_reverse_charge in Python
education.student-loan-repayment
A graduate's student or postgraduate loan repayment for a tax year, as Self Assessment works it out.
student_loan_repayment in Python
energy.price-cap
Ofgem energy price cap unit rate and daily standing charge for a fuel and payment method on a date (GB average).
price_cap in Python
energy.solar-generation
Estimated annual solar PV generation by the MCS method: kWp x Kk x shade factor, per array and in total.
solar_generation in Python
finance.late-payment-interest
UK statutory late payment interest (8% over Bank Rate) and fixed compensation under the Late Payment Act 1998.
late_payment_interest in Python
inventory.abc-classification
ABC classes by annual consumption value (Pareto), with configurable cut-offs such as 80/15/5 and deterministic ties.
abc_classification in Python
logistics.demurrage
Demurrage or detention charge for a container: free days, then a tiered daily rate from the carrier's tariff.
demurrage in Python
logistics.route-distance
Total great-circle distance of an ordered list of stops, leg by leg, optionally back to the start, to the millimetre.
route_distance in Python
manufacturing.bom-cost
Rolled-up standard cost of one unit of a product from its BOM, bought-in costs, and labour and overhead rates.
bom_cost in Python
manufacturing.bom-explode
Explode a multi-level bill of materials into exact total quantities per component, with scrap and cycle checks.
explode_bom in Python
money.convert
Convert an amount to another currency at a supplied exact rate, with an explicit rounding mode.
convert_money in Python
monitor.burn-rate-alert
Multiwindow, multi-burn-rate SLO alerting: which rules fire, from event counts per window (Google SRE workbook).
burn_rate_alert in Python
retail.oss-vat
EU distance-selling VAT: which member state's standard rate applies under OSS and the EUR 10,000 threshold, and the VAT.
oss_vat in Python
retail.promotion-apply
Apply BOGOF, 3-for-2, percent off, amount off and multibuy deals to a basket, best for the customer, allocated to lines.
apply_promotions in Python
retail.shipping-rate
Delivery charge from a dated rate table by service, zone, chargeable weight and size, with a free-over threshold.
shipping_rate in Python
validation.iban
Check an IBAN against the ISO 13616 mod-97-10 checksum and the registered length for its country.
is_iban in Python
validation.uk-vat-number
Check a UK VAT registration number against HMRC's mod-97 checksum, including the post-2010 9755 variant.
is_uk_vat_number in Python
agri.milk-price
Milk price per litre and payment from a contract's base price, butterfat/protein adjustments and bonuses.
milk_price in Python
auth.login-throttle
Allow a login attempt or lock the account out, from its recent failed attempts, with the seconds until it may retry.
login_throttle in Python
auth.password-hash
Hash a password for storage as pbkdf2_sha256$iterations$salt$hash, verify one in constant time, and spot weak hashes.
A group of 3:
hash_password, verify_password, password_needs_rehash
auth.password-policy
Check a new password against a named policy (NIST SP 800-63B-4 by default): length, common passwords, name and email.
A group of 2:
password_policy, check_password
banking.bacs-processing-date
Bacs three-day cycle: input, processing and entry (arrival) dates for a submission, skipping weekends and bank holidays.
bacs_processing_dates in Python
charity.payroll-giving
UK Payroll Giving for one pay period: the donation comes off pay before PAYE, and the tax it saves the employee.
payroll_giving in Python
charity.restricted-funds
Allocate charity spending to restricted funds first, then unrestricted funds, never overdrawing a restricted fund.
allocate_fund_spend in Python
charts.axis
Axis geometry as data: tick positions, tick marks, label anchors and gridlines for number, time and category axes.
A group of 5:
axis_from_ticks, number_axis, time_axis, band_axis, grid_lines
charts.layout
Chart layout: the plot area inside margins, legend items wrapped into rows, and greedy label collision avoidance.
A group of 3:
plot_area, legend_rows, avoid_collisions
construction.day-rate-quote
A trade quote from labour days at a day rate, materials with a markup, and VAT.
day_rate_quote in Python
construction.payment-notice-dates
Construction Act default dates: payment due, payment notice, final date for payment and pay-less notice.
payment_notice_dates in Python
education.fee-instalments
Tuition fee instalment schedule from a total, shares and due dates, exact to the penny.
fee_instalments in Python
education.weighted-grade
Weighted percentage across coursework and exam components, exact as a fraction, then rounded once.
weighted_grade in Python
energy.climate-change-levy
Climate Change Levy on a business supply of electricity, gas, LPG or solid fuel, at the main rate in force on the date.
climate_change_levy in Python
energy.water-bill
Metered water and sewerage bill from two reads: volumetric charges, return to sewer, standing and surface water charges.
water_bill in Python
finance.accruals-prepayments
Split an invoice across accounting periods by days of service, for accruals, prepayments and deferred income.
allocate_to_periods in Python
finance.aged-debt
Aged debt report: open invoices bucketed as current, 1-30, 31-60, 61-90 and 90+ days overdue as at a date.
aged_debt in Python
finance.bank-reconcile-match
Match bank statement lines to ledger entries by exact amount, a date window and reference similarity, deterministically.
match_bank_lines in Python
finance.compound-interest
Compound interest accrued period by period in minor units, the way a statement is built.
compound_interest in Python
finance.depreciation-reducing-balance
Reducing-balance depreciation schedule at a fixed rate, writing off to the residual value in the final year.
reducing_balance_depreciation in Python
finance.depreciation-straight-line
Straight-line depreciation schedule whose charges sum exactly to cost less residual value.
straight_line_depreciation in Python
finance.early-payment-discount
Early settlement discount available on a payment date under "2/10 net 30" style terms, and the amount to pay.
early_payment_discount in Python
finance.invoice.line-total
Net total for one invoice line: unit price by quantity, less a discount.
line_total in Python
finance.ledger.trial-balance
Trial balance from journal lines: debit or credit balance per account, and proof that debits equal credits.
trial_balance in Python
finance.margin
Profit on a sale with both the margin and the markup, so the two are never confused.
margin in PythonLevel 3 business operation
finance.invoice.calculate
Calculate a complete invoice: line nets, VAT per line, totals and a VAT summary grouped by rate.
calculate_invoice in Python
charity.reclaim-batch
Gift Aid claim totals for a period from donation records: donor lines, aggregated small gifts, tax due.
gift_aid_claim_batch in Python
charts.bar-chart
Complete bar chart geometry as data, grouped or stacked: plot area, axes, gridlines, bar rectangles, colours, legend.
bar_chart in Python
finance.credit-note.calculate
Credit note against an original invoice, by units or by amount, with VAT at the original tax point's rates.
calculate_credit_note in Python
retail.basket-total
Total a basket: line prices, promotions, a basket discount, VAT per line and delivery, into one checked total.
basket_total in Python
subscriptions.invoice
A subscription renewal invoice: plan, add-ons and usage, coupon discounts by billing period, and VAT.
renewal_invoice in Python
auth.validate-login
Check a login form (email, password): the normalised email to look up, or a message for each field to fix.
validate_login in Python
auth.validate-password-change
Check a change-password form: current password given and correct, new one meeting the policy and different.
validate_password_change in Python
auth.validate-registration
Validate a sign-up form (email, password, name) in one call, with a message per field, in the browser and the API alike.
validate_registration in Python
charts.line-chart
Complete line chart geometry as data: plot area, number or date axes, gridlines, series paths, colours, legend.
line_chart in Python
charts.sparkline
A sparkline's SVG path and end marker from a series, fitted into a box, with gaps left as breaks.
sparkline in Python
construction.valuation
Interim valuation: gross value to date, retention, previous payments, amount due, VAT or reverse charge, and CIS.
interim_valuation in Python
energy.bill-calculate
Electricity or gas bill from two meter reads: energy, standing charge, Climate Change Levy and VAT.
calculate_energy_bill in Python