import type { ValueOf } from '../../types/util'; export const DECIMAL_UNITS = Object.freeze({ ONE: 1, TEN: 10, HUNDRED: 100, THOUSAND: 1_000, MILLION: 1_000_000, BILLION: 1_000_000_000, TRILLION: 1_000_000_000_000, }); export type DecimalUnits = ValueOf<typeof DECIMAL_UNITS>; const TEN_THOUSAND = DECIMAL_UNITS.THOUSAND * 10; const TEN_MILLIONS = DECIMAL_UNITS.MILLION * 10; export type ShortNumber = [number, DecimalUnits, 0 | 1]; // Array of: shorten number, unit of shorten number and maximum fraction digits /** * @param sourceNumber Number to convert to short number * @returns Calculated short number * @example * shortNumber(5936); * // => [5.936, 1000, 1] */ export function toShortNumber(sourceNumber: number): ShortNumber { if (sourceNumber < DECIMAL_UNITS.THOUSAND) { return [sourceNumber, DECIMAL_UNITS.ONE, 0]; } else if (sourceNumber < DECIMAL_UNITS.MILLION) { return [ sourceNumber / DECIMAL_UNITS.THOUSAND, DECIMAL_UNITS.THOUSAND, sourceNumber < TEN_THOUSAND ? 1 : 0, ]; } else if (sourceNumber < DECIMAL_UNITS.BILLION) { return [ sourceNumber / DECIMAL_UNITS.MILLION, DECIMAL_UNITS.MILLION, sourceNumber < TEN_MILLIONS ? 1 : 0, ]; } else if (sourceNumber < DECIMAL_UNITS.TRILLION) { return [sourceNumber / DECIMAL_UNITS.BILLION, DECIMAL_UNITS.BILLION, 0]; } return [sourceNumber, DECIMAL_UNITS.ONE, 0]; } /** * @param sourceNumber Original number that is shortened * @param division The scale in which short number is displayed * @returns Number that can be used for plurals when short form used * @example * pluralReady(1793, DECIMAL_UNITS.THOUSAND) * // => 1790 */ export function pluralReady( sourceNumber: number, division: DecimalUnits | null, ): number { if (division == null || division < DECIMAL_UNITS.HUNDRED) { return sourceNumber; } const closestScale = division / DECIMAL_UNITS.TEN; return Math.trunc(sourceNumber / closestScale) * closestScale; } export function roundTo10(num: number): number { return Math.round(num * 0.1) / 0.1; }