reduce(object, path, reducer) ⇒ Object | Array.<any>

one of additional functions to work with array items

Returns: Object | Array.<any> - updated object Params

• object Object | Array.<any> - object to update
• path string | Array.<string> - path to be updated
• reducer function - reducer function

Description

import { reduce } from 'immutable-object-update';

const state = {
    a: {
        b: [ 1, 2, 3, 4, 5 ]
    }
};
const sum = (acc, item) => acc + item;

const updated = reduce(state, [ 'a', 'b' ], sum);

// or

const updated = reduce(state, 'a.b', sum);

As a result we will receive new object with structure below:

{
    a: {
        b: 15
    }
}

Please note: first element of array will be always used as initial value