JavaScript Set

In JavaScript, Set is a collection of unique values. In a Set, each values will occur only once.

Create a Set

In JavaScript, a Set can be created using new Set() constructor.

Example

// Create a Set  
const letters = new Set();
// Create a Set with default values
const employeeIds = new Set([1,3,2,4]);

add() method

The add() method is used to add the elements to the set.

Example

let letters = new Set();
letters.add("a");  
letters.add("b");  
letters.add("c");

Iteration Set() methods

The foreach() mehod is used to iterate through the Set elements.

// Create a Set  
const letters = new Set(["a","b","c"]);  
  
// List all Elements  
letters.forEach (function(value) {  
    console.log(value);
})

values() method

The values() method is used to iterate the Set and returns the value of it.

Example

const letters = new Set(["a","b","c"]);
for (const x of letters.values()) {  
    console.log(x);
}