4.17.11
3.10.1
2.4.2
1.3.1
_.mergeWith(object, sources, customizer)
This method is like _.merge
except that it accepts customizer
which
is invoked to produce the merged values of the destination and source
properties. If customizer
returns undefined
, merging is handled by the
method instead. The customizer
is invoked with six arguments:
(objValue, srcValue, key, object, source, stack).
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
) {
if (_.isArray(objValue)) {
return objValue.concat(srcValue);
}
}
var object = { a: [1], b: [2] };
var other = { a: [3], b: [4] };
_.mergeWith(object, other, customizer);
// => { 'a': [1, 3], 'b': [2, 4] }
function customizer(objValue, srcValue) {
if (_.isArray(objValue)) {
return objValue.concat(srcValue);
}
}
var object = { a: [1], b: [2] };
var other = { a: [3], b: [4] };
_.mergeWith(object, other, customizer);
// => { 'a': [1, 3], 'b': [2, 4] }