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

To use the findLastIndex function from the Underscore library in TypeScript, follow these steps:

1. Install the Underscore library using npm:

   index.ts
   npm install underscore --save
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2. Import the findLastIndex function from the Underscore library in your TypeScript file:

   index.ts
   import { findLastIndex } from 'underscore';
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3. Define an array of values to search through:

   index.ts
   const numbers = [1, 2, 3, 4, 5];
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4. Define the function that will be used to search through the array. For example, to find the last index of a number in the array that is greater than 2:

   index.ts
   const greaterThanTwo = (num: number) => num > 2;
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5. Call the findLastIndex function with the array and search function:

   index.ts
   const lastIndex = findLastIndex(numbers, greaterThanTwo);
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   The lastIndex variable will now contain the index of the last value in the array that is greater than 2.

Here's the complete example:

index.ts
import { findLastIndex } from 'underscore';

const numbers = [1, 2, 3, 4, 5];
const greaterThanTwo = (num: number) => num > 2;
const lastIndex = findLastIndex(numbers, greaterThanTwo);

console.log(lastIndex); // Output: 4
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