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

To use the compact function from the Lodash library in TypeScript, you'll first need to install the Lodash library using either npm or yarn:

npm install lodash

# or

yarn add lodash
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Once the library is installed, you can import the compact function into your TypeScript file and start using it on arrays. For example, let's say you have an array of numbers that may contain falsy values:

index.ts
import { compact } from 'lodash';

const numbers = [0, 1, false, 2, '', 3];

const compactedNumbers = compact(numbers);

console.log(compactedNumbers); // [1, 2, 3]
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In this example, the compact function removes all falsy values from the numbers array, leaving only the truthy values behind. The resulting array (compactedNumbers) is then logged to the console, which will output [1, 2, 3].

Note that using the compact function from Lodash is not strictly necessary if you're only dealing with falsy values, since you can achieve the same result using the native filter method on an array:

index.ts
const numbers = [0, 1, false, 2, '', 3];

const truthyNumbers = numbers.filter(Boolean);

console.log(truthyNumbers); // [1, 2, 3]
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However, the compact function can be useful in situations where you want to remove both falsy values and other values that evaluate to null or undefined.