How to Convert Array to Set in JavaScript?

Last Updated : 31 Jul, 2019

The task is to convert a JavaScript Array to a Set with the help of JavaScript. we’re going to discuss few techniques.

Approach:

Take the JavaScript array into a variable.
Use the new keyword to create a new set and pass the JavaScript array as it first and only argument.
This will automatically create the set of the provided array.

Example 1: In this example, the array is converted into set using the same approach defined above.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Convert Array to Set. 
    </title> 
</head> 
  
<body style="text-align:center;"
      id="body"> 
    <h1 style="color:green;" 
        id="h1">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP" 
       style="font-size: 15px;  
              font-weight: bold;"> 
    </p> 
    <button onclick="GFG_Fun()"> 
        click here 
    </button> 
    <p id="GFG_DOWN" 
       style="color:green;  
              font-size: 20px; 
              font-weight: bold;"> 
    </p> 
    <script> 
        var up = document.getElementById('GFG_UP'); 
        var down = document.getElementById('GFG_DOWN'); 
        var A = [1, 1, 2, 2, 2, 2, 5, 5]; 
        
        up.innerHTML = "Click on the button to convert"+ 
          " the array to set.<br>" + "Array - [" + A + "]"; 
  
        function GFG_Fun() { 
            var set = new Set(A); 
            down.innerHTML = JSON.stringify([...set]); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

Example 2: In this example, the array is converted into set using a bit approach than above.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Convert Array to Set. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;" id="h1">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP" 
       style="font-size: 15px;  
              font-weight: bold;"> 
    </p> 
    <button onclick="GFG_Fun()"> 
        click here 
    </button> 
    <p id="GFG_DOWN" 
       style="color:green;  
              font-size: 20px;  
              font-weight: bold;"> 
    </p> 
    <script> 
        var up = document.getElementById('GFG_UP'); 
        var down = document.getElementById('GFG_DOWN'); 
        
        var A = ["A", "A", "Computer Science", "portal",  
                 "for", "for", "Geeks", "Geeks"]; 
        
        up.innerHTML = "Click on the button to convert "+ 
          "the array to set.<br>" + "Array - [" + A + "]"; 
  
        function GFG_Fun() { 
            var set = new Set(A); 
            down.innerHTML = JSON.stringify([...set.keys()]); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

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