lodash.merge

Deep merging of objects

This feature allows for the deep merging of nested objects, combining properties from both source and destination objects.

{"const object = { 'a': [{ 'b': 2 }, { 'd': 4 }] };
const other = { 'a': [{ 'c': 3 }, { 'e': 5 }] };

_.merge(object, other);
// => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }"}

Merging with customizer function

This feature allows users to specify a customizer function that determines how merging is handled. It's useful for custom merge behavior on specific properties.

{"function customizer(objValue, srcValue) {
  if (_.isArray(objValue)) {
    return objValue.concat(srcValue);
  }
}

const object = { 'a': [1], 'b': [2] };
const other = { 'a': [3], 'b': [4] };

_.mergeWith(object, other, customizer);
// => { 'a': [1, 3], 'b': [2, 4] }"}