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29 lines
570 B
JavaScript
29 lines
570 B
JavaScript
define([], function() {
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/** Used as a safe reference for `undefined` in pre-ES5 environments. */
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var undefined;
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/**
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* Checks if `value` is `undefined`.
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*
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* @static
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* @since 0.1.0
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* @memberOf _
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
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* @example
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*
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* _.isUndefined(void 0);
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* // => true
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*
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* _.isUndefined(null);
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* // => false
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*/
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function isUndefined(value) {
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return value === undefined;
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}
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return isUndefined;
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});
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