How to add an array of values to a Set

Question

The old school way of adding all values of an array into the Set is:

// for the sake of this example imagine this set was created somewhere else 
// and I ca         


        

Answer 1

@Fuzzyma, I'll suggest you to use Prototyping of JavaScript to define new method on Set.

Do not use in-built method name defined on Set.

If you still prefer to use the same function name as in-built function name like add then the better approach would be to inherit the Set and override add() method.

This is better way to add methods to existing objects without affecting their methods and use our own methods with same name. The charisma of Method overriding, a nice OOP concept.

Here in the below code, I have defined addItems() on Set.

Try it online at http://rextester.com/LGPQC98007.

var arr = [3, 7, 8, 75, 65, 32, 98, 32, 3];
var array = [100, 3, 200, 98, 65, 300]; 

// Create a Set
var mySet = new Set(arr);
console.log(mySet);

// Adding items of array to mySet
Set.prototype.addItems = function(array) {
    for(var item of array){
        this.add(item)
    }
}

mySet.addItems(array);
console.log(mySet)

» Output

Set { 3, 7, 8, 75, 65, 32, 98 }
Set { 3, 7, 8, 75, 65, 32, 98, 100, 200, 300 }