Add differenceBy function

[ppeeou]

Suggestion

⭐ Suggestion

💻 Use Cases

const iter = differenceBy(a => a.x, [{ x: 1 }, { x: 4 }], [{ x: 1 },  { x: 2 },  { x: 3 } ])
iter.next(); // {value: {x: 2}, done: false}
iter.next(); // {value: {x: 3}, done: false}
iter.next(); // {value: undefined, done: true}