utility-function-extractor/packages/webpage-refactor/lib/truncateNums.js

40 lines
1.1 KiB
JavaScript

let topOutAt100AndValidate = (x) => {
if (x == x) {
return x > 99 ? 99 : x < 0 ? 2 : x;
} else {
return 10;
}
};
export const toLocale = (x) => Number(x).toLocaleString();
export const truncateValueForDisplay = (value) => {
let result;
if (value > 10) {
result = Number(Math.round(value).toPrecision(2));
} else if (value > 1) {
result = Math.round(value * 10) / 10;
} else if (value > 0) {
let candidateNumSignificantDigits =
-Math.floor(Math.log(value) / Math.log(10)) + 1;
let numSignificantDigits = topOutAt100AndValidate(
candidateNumSignificantDigits
);
result = value.toFixed(numSignificantDigits);
} else if (value == 0) {
return 0;
} else if (-1 < value) {
let candidateNumSignificantDigits =
-Math.floor(Math.log(Math.abs(value)) / Math.log(10)) + 1;
let numSignificantDigits = topOutAt100AndValidate(
candidateNumSignificantDigits
);
result = value.toFixed(numSignificantDigits);
} else if (value <= -1) {
result = "-" + toLocale(truncateValueForDisplay(-value));
} else {
result = toLocale(value); //return "~0"
}
return result;
};