Use the JavaScript Set size property to get the number of elements in a Set object. The size property returns the number of values in the Set object.
mySet.sizeAs opposed to the array’s length property, the size property is read-only and can’t be changed by the user.
JavaScript Set size
Simple example code.
<!DOCTYPE html>
<html>
<body>
<script>
const set1 = new Set([1,2,3,4]);
console.log(set1);
console.log("size", set1.size);
</script>
</body>
</html>Output:
More examples
const set1 = new Set();
const object1 = {};
set1.add(42);
set1.add('forty two');
set1.add('forty two');
set1.add(object1);
console.log(set1.size); // 3const set = new Set(['a', 'b', 'c']);
console.log(set.size); // 👉️ 3
set.add('d');
set.add('e');
console.log(set.size); // 👉️ 5
Do comment if you have any doubts or suggestions on this Js set property topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version