Underscore.js is a JavaScript library that makes operations on arrays, string, objects much easier and handy.
he _.isWeakSet() function is used to check whether the given object is JavaScript weakset or not. When linking the underscore.js CDN, the “_” is attached to the browser as global variable.
Syntax :
_.isWeakSet( object );
Parameters:
- object: It is any JavaScript object such as array, string, maps, set etc.
Return Value: It returns the boolean value. If the set is a weak set it returns true otherwise returns false.
Example 1: When a weak set is given it returns true.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content= "width=device-width, initial-scale=1.0"> <script src= </script> </head> <body> <script> // Creating a weak set using // constructor var obj = new WeakSet(); // Using the _.weakSet() function var isWeakSet = _.isWeakSet(obj); console.log(isWeakSet) // If the given object is weakset // it prints the object is weak set. if (isWeakSet) console.log(`The ${obj} is the WeakSet of Javascript.`) else console.log(`The ${obj} is not the WeakSet of Javascript.`) </script> </body> </html> |
Output:
Example 2: When an array is given the output is false.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content= "width=device-width, initial-scale=1.0"> <script src= </script> </head> <body> <script> // Creating a array of size // 2 using constructor var obj = new Array(2); // Filling value 10in the array obj.fill(10) // Using the _.weakSet() function var isWeakSet = _.isWeakSet(obj); console.log(isWeakSet) // If the given object is weakset // it prints the object is weak set if (isWeakSet) console.log(`The ${obj} is the WeakSet of Javascript.`) else console.log(`The ${obj} is not the WeakSet of Javascript.`) </script> </body> </html> |
Output:
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