_createAssigner.js
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_createAssigner.js
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			var baseRest = require('./_baseRest'),
			isIterateeCall = require('./_isIterateeCall');

			/**
			* Creates a function like `_.assign`.
			*
			* @private
			* @param {Function} assigner The function to assign values.
			* @returns {Function} Returns the new assigner function.
			*/
			function createAssigner(assigner) {
			return baseRest(function(object, sources) {
			var index = -1,
			length = sources.length,
			customizer = length > 1 ? sources[length - 1] : undefined,
			guard = length > 2 ? sources[2] : undefined;

			customizer = (assigner.length > 3 && typeof customizer == 'function')
			? (length--, customizer)
			: undefined;

			if (guard && isIterateeCall(sources[0], sources[1], guard)) {
			customizer = length < 3 ? undefined : customizer;
			length = 1;
			}
			object = Object(object);
			while (++index < length) {
			var source = sources[index];
			if (source) {
			assigner(object, source, index, customizer);
			}
			}
			return object;
			});
			}

			module.exports = createAssigner;