55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
var baseMerge = require('../internal/baseMerge'),
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createAssigner = require('../internal/createAssigner');
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/**
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* Recursively merges own enumerable properties of the source object(s), that
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* don't resolve to `undefined` into the destination object. Subsequent sources
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* overwrite property assignments of previous sources. If `customizer` is
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* provided it is invoked to produce the merged values of the destination and
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* source properties. If `customizer` returns `undefined` merging is handled
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* by the method instead. The `customizer` is bound to `thisArg` and invoked
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* with five arguments: (objectValue, sourceValue, key, object, source).
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*
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* @static
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* @memberOf _
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* @category Object
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* @param {Object} object The destination object.
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* @param {...Object} [sources] The source objects.
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* @param {Function} [customizer] The function to customize assigned values.
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* @param {*} [thisArg] The `this` binding of `customizer`.
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* @returns {Object} Returns `object`.
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* @example
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*
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* var users = {
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* 'data': [{ 'user': 'barney' }, { 'user': 'fred' }]
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* };
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*
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* var ages = {
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* 'data': [{ 'age': 36 }, { 'age': 40 }]
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* };
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*
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* _.merge(users, ages);
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* // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] }
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*
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* // using a customizer callback
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* var object = {
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* 'fruits': ['apple'],
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* 'vegetables': ['beet']
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* };
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*
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* var other = {
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* 'fruits': ['banana'],
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* 'vegetables': ['carrot']
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* };
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*
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* _.merge(object, other, function(a, b) {
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* if (_.isArray(a)) {
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* return a.concat(b);
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* }
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* });
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* // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] }
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*/
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var merge = createAssigner(baseMerge);
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module.exports = merge;
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