4.17.11
3.10.1
2.4.2
1.3.1

_.assignWith(object, sources, [customizer])

sourcenpm package

This method is like _.assign except that it accepts customizer which is invoked to produce the assigned values. If customizer returns undefined, assignment is handled by the method instead. The customizer is invoked with five arguments: (objValue, srcValue, key, object, source).

Note: This method mutates object.

Since

4.0.0

Arguments

argument
object
sources
[customizer]
type
Object
...Object
Function
description
The destination object.
The source objects.
The function to customize assigned values.

Returns

(array)

Example

function customizer(
  objValue,
  srcValue
) {
  return _.isUndefined(objValue)
    ? srcValue
    : objValue;
}

var defaults = _.partialRight(
  _.assignWith,
  customizer
);

defaults({ a: 1 }, { b: 2 }, { a: 3 });
// => { 'a': 1, 'b': 2 }

function customizer(objValue, srcValue) {
  return _.isUndefined(objValue) ? srcValue : objValue;
}

var defaults = _.partialRight(_.assignWith, customizer);

defaults({ a: 1 }, { b: 2 }, { a: 3 });
// => { 'a': 1, 'b': 2 }