how to use the isfinite function from the underscore library in typescript

To use the isfinite function from the underscore library in TypeScript, you first need to install the underscore library and its typescript type definitions. You can do this by running the following command in your project directory:

index.ts
npm install underscore @types/underscore --save
48 chars
2 lines

Once you have installed underscore and its type definitions, you can import the isfinite function from underscore in your TypeScript file as follows:

index.ts
import * as _ from 'underscore';

const result = _.isFinite(42);
console.log(result); // true
94 chars
5 lines

The TypeScript type definition of the function isFinite is declared as _.isFinite(value: any): boolean, where value can be any value that needs to be checked for its finiteness.

Note that the isFinite method of the global object in JavaScript has a different signature than underscore's isFinite, and should not be used mistakenly.