24 lines
738 B
TypeScript
24 lines
738 B
TypeScript
const numberFormatDigits = 1;
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function formatNumber(num: number): string {
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type UnitLookup = { value: number; symbol: string };
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const lookup: UnitLookup[] = [
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{ value: 1, symbol: '' },
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{ value: 1e3, symbol: 'K' },
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{ value: 1e6, symbol: 'M' },
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{ value: 1e9, symbol: 'G' },
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{ value: 1e12, symbol: 'T' },
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{ value: 1e15, symbol: 'P' },
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{ value: 1e18, symbol: 'E' },
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];
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const rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
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let item: UnitLookup | undefined;
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for (item of lookup.slice().reverse()) {
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if (num >= item.value) break;
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}
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return item !== undefined
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? (num / item.value).toFixed(numberFormatDigits).replace(rx, '$1') +
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item.symbol
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: num.toFixed(numberFormatDigits).replace(rx, '$1');
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}
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