Source: \toNumber.js
import isObject from './isObject.js'
import isSymbol from './isSymbol.js'
/** Used as references for various `Number` constants. */
const NAN = 0 / 0
/** Used to match leading and trailing whitespace. */
const reTrim = /^\s+|\s+$/g
/** Used to detect bad signed hexadecimal string values. */
const reIsBadHex = /^[-+]0x[0-9a-f]+$/i
/** Used to detect binary string values. */
const reIsBinary = /^0b[01]+$/i
/** Used to detect octal string values. */
const reIsOctal = /^0o[0-7]+$/i
/** Built-in method references without a dependency on `root`. */
const freeParseInt = parseInt
/**
* Converts `value` to a number.
*
* @since 4.0.0
* @category Lang
* @param {*} value The value to process.
* @returns {number} Returns the number.
* @see isInteger, toInteger, isNumber
* @example
*
* toNumber(3.2)
* // => 3.2
*
* toNumber(Number.MIN_VALUE)
* // => 5e-324
*
* toNumber(Infinity)
* // => Infinity
*
* toNumber('3.2')
* // => 3.2
*/
function toNumber(value) {
if (typeof value == 'number') {
return value
}
if (isSymbol(value)) {
return NAN
}
if (isObject(value)) {
const other = typeof value.valueOf == 'function' ? value.valueOf() : value
value = isObject(other) ? `${ other }` : other
}
if (typeof value != 'string') {
return value === 0 ? value : +value
}
value = value.replace(reTrim, '')
const isBinary = reIsBinary.test(value)
return (isBinary || reIsOctal.test(value))
? freeParseInt(value.slice(2), isBinary ? 2 : 8)
: (reIsBadHex.test(value) ? NAN : +value)
}
export default toNumber