JavaScript Set clear() Method

The Set clear() method in JavaScript is used for the removal of all the elements from a set and making it empty.

Syntax:

mySet.clear();

Parameters:

• This method does not accept any parameters.

Return Value:

• Returns an undefined value.

Example 1: Emptying set using Set clear() method

// Create a new set using Set() constructor
let myset = new Set();

// Append new elements to the
// set using add() method
myset.add(23);

// Print the modified set
console.log(myset);
console.log(myset.size);

// The clear() method will remove 
// all elements from the set 
myset.clear();

// This will return 0 as there
// are no elements present in the Set
console.log(myset.size);

Set(1) { 23 }
1
0

Explanation:

• In the above example we Initializes a new Set called myset using the Set() constructor.
• Adds the element 23 to the set using the add() method and prints the set along with its size.
• Clears the set using the clear() method and prints its size again, which confirms it as 0.

Example 2: Emptying set using Set clear() method

// Create a new set using Set() constructor
let myset = new Set();

// Append new elements to the
// set using add() method
myset.add("Manchester");
myset.add("London");
myset.add("Leeds");

// Print the modified set
console.log(myset);
console.log(myset.size);

// The clear() method will remove
// all elements from the set 
myset.clear();

// This will return 0 as the set is empty
console.log(myset.size);

Set(3) { 'Manchester', 'London', 'Leeds' }
3
0

Explanation:

• In the above example we Initializes a new Set named myset using the Set() constructor.
• Adds three strings ("Manchester", "London", and "Leeds") to the set using the add() method and prints the set along with its size.
• Clears the set using the clear() method and prints its size again, confirming it as 0 since the set is empty.

We have a complete list of Javascript Set methods, to check those please go through this Sets in JavaScript article.

Supported Browsers:

• Google Chrome
• Edge
• Firefox
• Opera
• Safari