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

To use the reject function from the Underscore library in JavaScript, you first need to include the library in your project. This can be done by downloading the library and adding it to your project directory, or by using a CDN.

Once the library is included, you can use the reject function by passing it an array and a function. The function should return true or false depending on whether you want the item in the array to be included or excluded. The reject function will then return a new array containing only the items that were rejected by the function.

Here's an example of using the reject function to remove all even numbers from an array:

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

// create an array of numbers
const numbers = [1, 2, 3, 4, 5, 6];

// use the reject function to remove even numbers
const oddNumbers = _.reject(numbers, function(num) {
  return num % 2 === 0;
});

// oddNumbers will now contain [1, 3, 5]
308 chars
13 lines

In this example, the reject function is called with the numbers array and a function that checks whether each number is even. The reject function returns a new array containing only the odd numbers.