assignWith source npm
_.assignWith(object, sources, [customizer])
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
.
Arguments
- object (Object)
The destination object.
- sources (...Object)
The source objects.
- [customizer] (Function)
The function to customize assigned values.
Returns (Object)
Returns object
.
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 }