mapAssign

mapAssign(target, map)

Merges target object with the result of calling map function on target, creating a new object.

Looser version of mapMerge - mapAssign allows you to redefine keys and add new properties.

data-first

mapAssign({ a: 1, b: 2 }, (obj) => ({ c: obj.a + obj.b })); // { a: 1, b: 2, c: 3 }

data-last

pipe(
    { a: 1, b: 2 },
    mapAssign((obj) => ({ c: obj.a + obj.b })),
); // { a: 1, b: 2, c: 3 }