filter_the_number.js

// Description:
// Filter the number
// Oh, no! The number has been mixed up with the text. Your goal is to retrieve the number from the text, can you return the number back to its original state?
// Task
// Your task is to return a number from a string.
// Details
// You will be given a string of numbers and letters mixed up, you have to return all the numbers in that string in the order they occur.

// SOLUTION:

function filterString(value) {
    return +(value.split('').filter(el => !isNaN(el))).join('');
}