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67 lines
1.5 KiB
JavaScript
67 lines
1.5 KiB
JavaScript
6 years ago
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var isObject = require('./isObject'),
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isSymbol = require('./isSymbol');
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/** Used as references for various `Number` constants. */
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var NAN = 0 / 0;
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/** Used to match leading and trailing whitespace. */
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var reTrim = /^\s+|\s+$/g;
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/** Used to detect bad signed hexadecimal string values. */
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var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
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/** Used to detect binary string values. */
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var reIsBinary = /^0b[01]+$/i;
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/** Used to detect octal string values. */
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var reIsOctal = /^0o[0-7]+$/i;
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/** Built-in method references without a dependency on `root`. */
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var freeParseInt = parseInt;
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/**
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* Converts `value` to a number.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to process.
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* @returns {number} Returns the number.
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* @example
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*
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* _.toNumber(3.2);
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* // => 3.2
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*
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* _.toNumber(Number.MIN_VALUE);
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* // => 5e-324
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*
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* _.toNumber(Infinity);
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* // => Infinity
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*
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* _.toNumber('3.2');
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* // => 3.2
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*/
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function toNumber(value) {
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if (typeof value == 'number') {
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return value;
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}
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if (isSymbol(value)) {
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return NAN;
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}
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if (isObject(value)) {
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var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
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value = isObject(other) ? (other + '') : other;
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}
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if (typeof value != 'string') {
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return value === 0 ? value : +value;
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}
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value = value.replace(reTrim, '');
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var isBinary = reIsBinary.test(value);
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return (isBinary || reIsOctal.test(value))
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? freeParseInt(value.slice(2), isBinary ? 2 : 8)
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: (reIsBadHex.test(value) ? NAN : +value);
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}
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module.exports = toNumber;
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