Underscore.js _.isWeakSet() Function
Last Updated :
10 Jul, 2020
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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