@terminus/ngx-tools
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28 lines • 3.57 kB
JavaScript
import { isNumber } from '@terminus/ngx-tools/type-guards';
/**
* Round a number
*
* Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round#A_better_solution
*
* @param num - The number to round (also accepting strings for exponential support)
* @param precision - How precise to make the rounding
* @returns The rounded number
*
* @example
* roundNumber(1.050, 1) // Returns: `1.1`
* roundNumber(3456.3456, 1) // Returns: `3456.3`
* roundNumber(3456.3456, -2) // Returns: `3500`
* roundNumber('1.23e+5', -4) // Returns: `120000`
*/
export function roundNumber(num, precision) {
if (precision === void 0) { precision = 0; }
if (!isNumber(num)) {
return undefined;
}
var shift = function (innerNum, innerPrecision) {
var numArray = innerNum.toString().split('e');
return +(numArray[0] + "e" + (numArray[1] ? (+numArray[1] + innerPrecision) : innerPrecision));
};
return shift(Math.round(shift(num, +precision)), -precision);
}
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