@newdash/newdash
Version:
javascript/typescript utility library
33 lines (32 loc) • 1.38 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const toNumber_1 = __importDefault(require("../toNumber"));
const toInteger_1 = __importDefault(require("../toInteger"));
const toString_1 = require("../toString");
/**
* Creates a function like `round`.
*
* @ignore
* @private
* @param {string} methodName The name of the `Math` method to use when rounding.
* @returns {Function} Returns the new round function.
*/
function createRound(methodName) {
var func = Math[methodName];
return function (number, precision) {
number = (0, toNumber_1.default)(number);
precision = precision == null ? 0 : Math.min((0, toInteger_1.default)(precision), 292);
if (precision && isFinite(number)) {
// Shift with exponential notation to avoid floating-point issues.
// See [MDN](https://mdn.io/round#Examples) for more details.
var pair = ((0, toString_1.toString)(number) + 'e').split('e'), value = func(pair[0] + 'e' + (+pair[1] + precision));
pair = ((0, toString_1.toString)(value) + 'e').split('e');
return +(pair[0] + 'e' + (+pair[1] - precision));
}
return func(number);
};
}
exports.default = createRound;