JS - utils vol. 3

Dodajemy kolejne utils – tym razem do pracy na obiektach. Chcemy robić kopie obiektów zamiast modyfikacji już istniejących.

Na początek funkcja objectWithout:

function objectWithout(obj, property){
    let {[property]: removed, ...without} = obj;
    return without;
}

let obj = {
    name: "blabla",
    age: 30,
}

let obj2 = objectWithout(obj, "age");

console.log(obj2);
//Object { name: "blabla" }

Analogiczna funkcja objectWith:

function objectWith(obj, property, value){
    return {...obj, [property] : value};
}

let obj3 = objectWith(obj, "id", 3);

console.log(obj3);
//Object { name: "blabla", age: 30, id: 3 }

Teraz objectWithUpdated:

function objectWithUpdated(obj, property, value){
    let {[property]: removed, ...without} = obj;
    return {[property]: value, ...without};
}

let obj4 = objectWithUpdated(obj3, "id", 4);

console.log(obj4);
//Object { id: 4, name: "blabla", age: 30 }

Na koniec objectWithMutated:

function objectWithMutated(obj, property, cb){

    let {[property]: removed, ...without} = obj;
    let value = cb(removed);

    return {[property]:value, ...without};

}

let obj5 = objectWithMutated(obj4, "id", (id) => id+1);

console.log(obj5);
//Object { id: 5, name: "blabla", age: 30 }

Więcej utils wkrótce.

JS – utils vol. 3