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47 lines
1.2 KiB
47 lines
1.2 KiB
var Symbol = require('./_Symbol'),
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isSymbol = require('./isSymbol');
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/** Used as references for various `Number` constants. */
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var INFINITY = 1 / 0;
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/** Used to convert symbols to primitives and strings. */
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var symbolProto = Symbol ? Symbol.prototype : undefined,
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symbolToString = symbolProto ? symbolProto.toString : undefined;
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/**
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* Converts `value` to a string if it's not one. An empty string is returned
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* for `null` and `undefined` values. The sign of `-0` is preserved.
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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 {string} Returns the string.
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* @example
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*
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* _.toString(null);
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* // => ''
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*
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* _.toString(-0);
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* // => '-0'
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*
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* _.toString([1, 2, 3]);
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* // => '1,2,3'
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*/
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function toString(value) {
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// Exit early for strings to avoid a performance hit in some environments.
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if (typeof value == 'string') {
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return value;
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}
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if (value == null) {
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return '';
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}
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if (isSymbol(value)) {
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return symbolToString ? symbolToString.call(value) : '';
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}
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var result = (value + '');
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return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
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}
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module.exports = toString;
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