flatten.js
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flatten.js
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			var baseFlatten = require('./_baseFlatten');

			/**
			* Flattens `array` a single level deep.
			*
			* @static
			* @memberOf _
			* @since 0.1.0
			* @category Array
			* @param {Array} array The array to flatten.
			* @returns {Array} Returns the new flattened array.
			* @example
			*
			* _.flatten([1, [2, [3, [4]], 5]]);
			* // => [1, 2, [3, [4]], 5]
			*/
			function flatten(array) {
			var length = array == null ? 0 : array.length;
			return length ? baseFlatten(array, 1) : [];
			}

			module.exports = flatten;