how to use the isweakmap function from the underscore library in javascript

The isWeakMap function in the Underscore library checks whether a given value is a JavaScript WeakMap object or not. Here's an example of how to use it:

index.tsx
const _ = require('underscore');

const wm = new WeakMap();
const map = new Map();

console.log(_.isWeakMap(wm)); // true
console.log(_.isWeakMap(map)); // false
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In the example above, we import the Underscore library using the require function (assuming we're working in Node.js). We then create a WeakMap object called wm and a normal Map object called map. Finally, we use the isWeakMap function to check whether wm is a WeakMap, which returns true, and whether map is a WeakMap, which returns false.

To use isWeakMap, you need to have the Underscore library installed and imported in your JavaScript file.