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

To use the findLastKey function from the Lodash library in TypeScript, first you need to install the Lodash library using npm:

index.ts
npm install lodash
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Then, you can import the findLastKey function from the Lodash library in your TypeScript file like this:

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

interface Obj {
  [key: string]: number;
}

const obj: Obj = {
  a: 1,
  b: 2,
  c: 3,
  d: 4,
};

const result = _.findLastKey(obj, (num) => num % 2 === 0);

console.log(result); // Output: 'd'
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In this example, we have defined an interface Obj to define the key-value pairs of an object. Then, we have created an object obj with some key-value pairs.

Finally, we have used the findLastKey function from the Lodash library to find the key of the last element in the object obj whose value is even. The callback function (num) => num % 2 === 0 passed as the second argument to the findLastKey function checks if a number is even or not.

The result variable will contain the key of the last element in the object obj whose value is even, which is 'd'.