1
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var isObject = require('./isObject'),
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2
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isSymbol = require('./isSymbol');
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3
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4
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/** Used as references for various `Number` constants. */
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5
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var NAN = 0 / 0;
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6
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7
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/** Used to match leading and trailing whitespace. */
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8
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var reTrim = /^\s+|\s+$/g;
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9
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10
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/** Used to detect bad signed hexadecimal string values. */
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11
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var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
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12
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13
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/** Used to detect binary string values. */
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14
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var reIsBinary = /^0b[01]+$/i;
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15
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16
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/** Used to detect octal string values. */
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17
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var reIsOctal = /^0o[0-7]+$/i;
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18
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|
19
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/** Built-in method references without a dependency on `root`. */
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20
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var freeParseInt = parseInt;
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21
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|
22
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/**
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23
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* Converts `value` to a number.
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24
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*
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25
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* @static
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26
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* @memberOf _
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27
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* @since 4.0.0
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28
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* @category Lang
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29
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* @param {*} value The value to process.
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30
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* @returns {number} Returns the number.
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31
|
* @example
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32
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*
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33
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* _.toNumber(3.2);
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34
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* // => 3.2
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35
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*
|
36
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* _.toNumber(Number.MIN_VALUE);
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37
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* // => 5e-324
|
38
|
*
|
39
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* _.toNumber(Infinity);
|
40
|
* // => Infinity
|
41
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*
|
42
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* _.toNumber('3.2');
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43
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* // => 3.2
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44
|
*/
|
45
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function toNumber(value) {
|
46
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if (typeof value == 'number') {
|
47
|
return value;
|
48
|
}
|
49
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if (isSymbol(value)) {
|
50
|
return NAN;
|
51
|
}
|
52
|
if (isObject(value)) {
|
53
|
var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
|
54
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value = isObject(other) ? (other + '') : other;
|
55
|
}
|
56
|
if (typeof value != 'string') {
|
57
|
return value === 0 ? value : +value;
|
58
|
}
|
59
|
value = value.replace(reTrim, '');
|
60
|
var isBinary = reIsBinary.test(value);
|
61
|
return (isBinary || reIsOctal.test(value))
|
62
|
? freeParseInt(value.slice(2), isBinary ? 2 : 8)
|
63
|
: (reIsBadHex.test(value) ? NAN : +value);
|
64
|
}
|
65
|
|
66
|
module.exports = toNumber;
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