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JavaScript Set.size Property

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  • Last Updated : 02 Mar, 2022
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The Set.size property in JavaScript returns the number of elements in a Set. If the Set is empty the size of the set will be returned as 0.

Syntax:

mySet.size

Here are some examples to illustrate the size property of JavaScript Set object:

Example 1:

Javascript




<script>
 
    // Create a new set using Set() constructor
    let myset = new Set();
 
    // Append new elements to the
    // set using add() method
    myset.add(23);
    myset.add(12);
 
    // Print the modified set
    console.log(myset);
 
    // As the set has 2 elements,
    // it will return 2.
    console.log(myset.size);
</script>


Output:

Set(2) { 23, 12 }
2

Example 2:

Javascript




<script>
 
    // Creating a new set
    let myset = new Set();
 
    // Adding new elements to the set
    myset.set('Manchester');
    myset.add('London');
    myset.add('Norwich');
 
    // As set has 3 elements, it will return 3
    console.log(set.size);
</script>


Output:

3

Supported Browsers:

  • Google Chrome:  38+
  • Firefox: 19+
  • Internet Explorer: 11+
  • Opera: 25+
  • Edge: 12+
  • Safari: 08+

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