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isEmpty.js
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define(['./_getLength', './isArray', './isString', './isArguments', './keys'], function (_getLength, isArray, isString, isArguments, keys) { // Is a given array, string, or object empty? // An "empty" object has no enumerable own-properties. function isEmpty(obj) { if (obj == null) return true; // Skip the more expensive `toString`-based type checks if `obj` has no // `.length`. var length = _getLength(obj); if (typeof length == 'number' && ( isArray(obj) || isString(obj) || isArguments(obj) )) return length === 0; return _getLength(keys(obj)) === 0; } return isEmpty; });