Function M

Returns a value that is interpreted as a mapper (from the key, old value and object to the new value) in the
sets function.

Example

import { set, M } from 'deleight/object/sharedmember'
let obj1 = { a: 20, b: 2, c: 20}, obj2 = { a: 1, b: 20, c: 3};
const objects = { a: [obj1], b: [obj2], c: [obj1] };

set(objects, M((obj, key) => obj[key] * 2));
console.log(obj1);    // { a: 40, b: 2, c: 40}
console.log(obj2);    // { a: 1, b: 40, c: 3}
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