Node.js util.types.isWeakSet() Method
The util.types.isWeakSet() method is an inbuilt application programming interface of util module which is primarily designed to support the needs of Node.js own internal APIs.
The util.types.isWeakSet() method is used to determine whether the value is a built-in WeakSet instance or not.
Syntax:
util.types.isWeakSet( value )
Parameters: This method accepts a single parameters value which holds any valid JavaScript data types like Boolean, Null, Number, Object, etc.
Return value: It returns a Boolean value i.e. returns true if it is an instance of built-in WeakSet, otherwise it returns false.
Below examples illustrate the use of util.types.isWeakSet() method in Node.js:
Example 1:
const util = require( 'util' );
console.log(util.types.isWeakSet( true ));
console.log(util.types.isWeakSet( "set" ));
console.log(util.types.isWeakSet( new WeakSet()));
|
Output:
false
false
true
Example 2:
const util = require( 'util' );
const a = new WeakSet();
a.add( new Boolean( true ));
const b = new WeakSet();
console.log(util.types.isWeakSet(a));
console.log(util.types.isWeakSet(b));
|
Output:
true
true
Note: The above program will compile and run by using the node index.js
command.
Reference: https://nodejs.org/dist/latest-v13.x/docs/api/util.html#util_util_types_isweakset_value
Last Updated :
13 Oct, 2021
Like Article
Save Article
Share your thoughts in the comments
Please Login to comment...