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formatPercent: always show at least one sig fig

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This commit is contained in:
mantikoros 2022-03-19 11:20:30 -05:00
parent 47f95678bd
commit ae0cb4fc8c
1 changed files with 14 additions and 4 deletions
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18
common/util/format.ts
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@ -18,10 +18,20 @@ export function formatWithCommas(amount: number) {
return formatter.format(amount).replace('$', '') return formatter.format(amount).replace('$', '')
} }
export function formatPercent(zeroToOne: number) { const decimalPlaces = (x: number) => Math.ceil(-Math.log10(x)) - 2
// Show 1 decimal place if <2% or >98%, giving more resolution on the tails
const decimalPlaces = zeroToOne < 0.02 || zeroToOne > 0.98 ? 1 : 0 export function formatPercent(decimalPercent: number) {
return (zeroToOne * 100).toFixed(decimalPlaces) + '%' const displayedFigs =
(decimalPercent >= 0.02 && decimalPercent <= 0.98) ||
decimalPercent <= 0 ||
decimalPercent >= 1
? 0
: Math.max(
decimalPlaces(decimalPercent),
decimalPlaces(1 - decimalPercent)
)
return (decimalPercent * 100).toFixed(displayedFigs) + '%'
} }
export function toCamelCase(words: string) { export function toCamelCase(words: string) {