@polkadot/util/format/si.js

A collection of useful utilities for @polkadot

/** @internal */
export const SI_MID = 8;
/** @internal */
export const SI = [
    { power: -24, text: 'yocto', value: 'y' },
    { power: -21, text: 'zepto', value: 'z' },
    { power: -18, text: 'atto', value: 'a' },
    { power: -15, text: 'femto', value: 'f' },
    { power: -12, text: 'pico', value: 'p' },
    { power: -9, text: 'nano', value: 'n' },
    { power: -6, text: 'micro', value: 'µ' },
    { power: -3, text: 'milli', value: 'm' },
    { power: 0, text: 'Unit', value: '-' }, // position 8
    { power: 3, text: 'Kilo', value: 'k' },
    { power: 6, text: 'Mill', value: 'M' }, // Mega, M
    { power: 9, text: 'Bill', value: 'B' }, // Giga, G
    { power: 12, text: 'Tril', value: 'T' }, // Tera, T
    { power: 15, text: 'Peta', value: 'P' },
    { power: 18, text: 'Exa', value: 'E' },
    { power: 21, text: 'Zeta', value: 'Z' },
    { power: 24, text: 'Yotta', value: 'Y' }
];
/** @internal */
export function findSi(type) {
    // use a loop here, better RN support (which doesn't have [].find)
    for (let i = 0, count = SI.length; i < count; i++) {
        if (SI[i].value === type) {
            return SI[i];
        }
    }
    return SI[SI_MID];
}
/** @internal */
export function calcSi(text, decimals, forceUnit) {
    if (forceUnit) {
        return findSi(forceUnit);
    }
    const siDefIndex = (SI_MID - 1) + Math.ceil((text.length - decimals) / 3);
    return SI[siDefIndex] || SI[siDefIndex < 0 ? 0 : SI.length - 1];
}