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var bindCallback = require('./bindCallback'), isIterateeCall = require('./isIterateeCall'), restParam = require('../function/restParam'); /** * Creates a `_.assign`, `_.defaults`, or `_.merge` function. * * @private * @param {Function} assigner The function to assign values. * @returns {Function} Returns the new assigner function. */ function createAssigner(assigner) { return restParam(function(object, sources) { var index = -1, length = object == null ? 0 : sources.length, customizer = length > 2 ? sources[length - 2] : undefined, guard = length > 2 ? sources[2] : undefined, thisArg = length > 1 ? sources[length - 1] : undefined; if (typeof customizer == 'function') { customizer = bindCallback(customizer, thisArg, 5); length -= 2; } else { customizer = typeof thisArg == 'function' ? thisArg : undefined; length -= (customizer ? 1 : 0); } if (guard && isIterateeCall(sources[0], sources[1], guard)) { customizer = length < 3 ? undefined : customizer; length = 1; } while (++index < length) { var source = sources[index]; if (source) { assigner(object, source, customizer); } } return object; }); } module.exports = createAssigner;
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