how to use the isweakset function from the lodash library in typescript

To use the isWeakSet function from the Lodash library in TypeScript, you will need to install the Lodash package with the following command:

index.ts
npm install lodash
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Once you have installed Lodash, you can import the isWeakSet function from the package and use it in your TypeScript code. Here's an example:

index.ts
import _ from 'lodash';

const weakSet = new WeakSet();

console.log(_.isWeakSet(weakSet)); // Output: true
console.log(_.isWeakSet([])); // Output: false
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In this example, we import the Lodash module as _ and create a new WeakSet object named weakSet. We then call the isWeakSet function and pass it weakSet as an argument to check if weakSet is a WeakSet object. The function returns true if the object is a WeakSet and false otherwise.

If we pass an array as an argument to the function, it will return false. This is because arrays are not WeakSet objects.

TypeScript allows you to perform type checking on your code. If you want TypeScript to verify that the variable you are passing to isWeakSet is indeed a WeakSet, you can explicitly annotate the type of the variable:

index.ts
import _ from 'lodash';

const weakSet: WeakSet<any> = new WeakSet();

console.log(_.isWeakSet(weakSet)); // Output: true
console.log(_.isWeakSet([])); // Output: false
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In this example, we annotate the weakSet variable with the type WeakSet<any>. This tells TypeScript that weakSet is a WeakSet object that can hold any type of value.