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var keys = require('../object/keys');
/**
* A specialized version of `_.assign` for customizing assigned values without
* support for argument juggling, multiple sources, and `this` binding `customizer`
* functions.
*
* @private
* @param {Object} object The destination object.
* @param {Object} source The source object.
* @param {Function} customizer The function to customize assigned values.
* @returns {Object} Returns `object`.
*/
function assignWith(object, source, customizer) {
var index = -1,
props = keys(source),
length = props.length;
while (++index < length) {
var key = props[index],
value = object[key],
result = customizer(value, source[key], key, object, source);
if ((result === result ? (result !== value) : (value === value)) ||
(value === undefined && !(key in object))) {
object[key] = result;
}
}
return object;
}
module.exports = assignWith;
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