mirror of
https://github.com/mastodon/mastodon.git
synced 2024-12-15 15:44:56 +01:00
80 lines
2.1 KiB
JavaScript
80 lines
2.1 KiB
JavaScript
// @ts-check
|
|
|
|
export const DECIMAL_UNITS = Object.freeze({
|
|
ONE: 1,
|
|
TEN: 10,
|
|
HUNDRED: Math.pow(10, 2),
|
|
THOUSAND: Math.pow(10, 3),
|
|
MILLION: Math.pow(10, 6),
|
|
BILLION: Math.pow(10, 9),
|
|
TRILLION: Math.pow(10, 12),
|
|
});
|
|
|
|
const TEN_THOUSAND = DECIMAL_UNITS.THOUSAND * 10;
|
|
const TEN_MILLIONS = DECIMAL_UNITS.MILLION * 10;
|
|
|
|
/**
|
|
* @typedef {[number, number, number]} ShortNumber
|
|
* Array of: shorten number, unit of shorten number and maximum fraction digits
|
|
*/
|
|
|
|
/**
|
|
* @param {number} sourceNumber Number to convert to short number
|
|
* @returns {ShortNumber} Calculated short number
|
|
* @example
|
|
* shortNumber(5936);
|
|
* // => [5.936, 1000, 1]
|
|
*/
|
|
export function toShortNumber(sourceNumber) {
|
|
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 {number} sourceNumber Original number that is shortened
|
|
* @param {number} division The scale in which short number is displayed
|
|
* @returns {number} Number that can be used for plurals when short form used
|
|
* @example
|
|
* pluralReady(1793, DECIMAL_UNITS.THOUSAND)
|
|
* // => 1790
|
|
*/
|
|
export function pluralReady(sourceNumber, division) {
|
|
// eslint-disable-next-line eqeqeq
|
|
if (division == null || division < DECIMAL_UNITS.HUNDRED) {
|
|
return sourceNumber;
|
|
}
|
|
|
|
let closestScale = division / DECIMAL_UNITS.TEN;
|
|
|
|
return Math.trunc(sourceNumber / closestScale) * closestScale;
|
|
}
|
|
|
|
/**
|
|
* @param {number} num
|
|
* @returns {number}
|
|
*/
|
|
export function roundTo10(num) {
|
|
return Math.round(num * 0.1) / 0.1;
|
|
}
|