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23 lines
775 B
JavaScript
23 lines
775 B
JavaScript
define(['./baseTimes', '../isArguments', '../isArray', '../isLength', '../isString'], function(baseTimes, isArguments, isArray, isLength, isString) {
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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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* Creates an array of index keys for `object` values of arrays,
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* `arguments` objects, and strings, otherwise `null` is returned.
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*
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* @private
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* @param {Object} object The object to query.
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* @returns {Array|null} Returns index keys, else `null`.
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*/
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function indexKeys(object) {
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var length = object ? object.length : undefined;
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return (isLength(length) && (isArray(object) || isString(object) || isArguments(object)))
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? baseTimes(length, String)
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: null;
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}
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return indexKeys;
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});
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