| 1 | import Symbol from './_Symbol';
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| 2 | import isSymbol from './isSymbol';
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| 3 |
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| 4 | /** Used as references for various `Number` constants. */
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| 5 | var INFINITY = 1 / 0;
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| 6 |
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| 7 | /** Used to convert symbols to primitives and strings. */
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| 8 | var symbolProto = Symbol ? Symbol.prototype : undefined,
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| 9 | symbolToString = symbolProto ? symbolProto.toString : undefined;
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| 10 |
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| 11 | /**
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| 12 | * Converts `value` to a string if it's not one. An empty string is returned
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| 13 | * for `null` and `undefined` values. The sign of `-0` is preserved.
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| 14 | *
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| 15 | * @static
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| 16 | * @memberOf _
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| 17 | * @since 4.0.0
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| 18 | * @category Lang
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| 19 | * @param {*} value The value to process.
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| 20 | * @returns {string} Returns the string.
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| 21 | * @example
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| 22 | *
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| 23 | * _.toString(null);
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| 24 | * // => ''
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| 25 | *
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| 26 | * _.toString(-0);
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| 27 | * // => '-0'
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| 28 | *
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| 29 | * _.toString([1, 2, 3]);
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| 30 | * // => '1,2,3'
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| 31 | */
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| 32 | function toString(value) {
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| 33 | // Exit early for strings to avoid a performance hit in some environments.
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| 34 | if (typeof value == 'string') {
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| 35 | return value;
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| 36 | }
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| 37 | if (value == null) {
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| 38 | return '';
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| 39 | }
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| 40 | if (isSymbol(value)) {
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| 41 | return symbolToString ? symbolToString.call(value) : '';
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| 42 | }
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| 43 | var result = (value + '');
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| 44 | return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
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| 45 | }
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| 46 |
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| 47 | export default toString;
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