What is the shortest way to modify immutable objects using spread and destructuring operators

Question

I\'m looking for a pure function, to modify my immutable state object. The original state given as parameter must stay untouched. This is especially useful when working with fra

Answer 1

In a Map Function

To do this process within a map function (remove an attribute and add a new attribute on each object), given an array of objects -

const myArrayOfObjects = [
    {id: 1, keyToDelete: 'nonsense'},
    {id: 2, keyToDelete: 'rubbish'}
];

Delete the attribute keyToDelete, and add a new key newKey with the value "someVar".

myArrayOfObjects.map(({ keyToDelete, ...item}) => { ...item, newKey:'someVar'});

Updating the array to

[
    {id: 1, newKey:'someVar'},
    {id: 2, newKey:'someVar'}
]

See this great post for more information on the deletion method.