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import isObject from './isObject.js' |
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import isSymbol from './isSymbol.js' |
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/** Used as references for various `Number` constants. */ |
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const NAN = 0 / 0 |
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/** Used to match leading and trailing whitespace. */ |
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const reTrim = /^\s+|\s+$/g |
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/** Used to detect bad signed hexadecimal string values. */ |
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const reIsBadHex = /^[-+]0x[0-9a-f]+$/i |
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/** Used to detect binary string values. */ |
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const reIsBinary = /^0b[01]+$/i |
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/** Used to detect octal string values. */ |
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const reIsOctal = /^0o[0-7]+$/i |
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/** Built-in method references without a dependency on `root`. */ |
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const freeParseInt = parseInt |
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/** |
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* Converts `value` to a number. |
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* |
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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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* @see isInteger, toInteger, isNumber |
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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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const 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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const 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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export default toNumber |
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