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

The flatten function from the underscore library in JavaScript can be used to flatten a nested array of any depth into a single-level array.

Here's an example of how to use the flatten function in JavaScript:

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

const nestedArray = [1, [2], [3, [4]], 5]; // a nested array to be flattened

const flatArray = _.flatten(nestedArray); // use the flatten function to flatten the array

console.log(flatArray); // output: [ 1, 2, 3, 4, 5 ]
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In this example, we first require the underscore library using the require statement. Next, we define a nested array called nestedArray. We then use the flatten function to flatten the array, and store the result in a new array called flatArray. Finally, we log the flattened array to the console.

Note that the flatten function works recursively, meaning it will flatten any nested arrays within the original array.