Problem Explanation:

Remove all falsy values from an array.

Hint: 1

Falsy is something which evaluates to FALSE. There are only six falsy values in JavaScript: undefined, null, NaN, 0, "" (empty string), and false of course.

Hint: 2

We need to make sure we have all the falsy values to compare, we can know it, maybe with a function with all the falsy values...

Hint: 3

Then we need to add a filter() with the falsy values function...

Spoiler Alert!

Solution ahead!

Solution Code:

function bouncer(arr) {
  // Don't show a false ID to this bouncer.
  // I've a hammer fist.

  return arr.filter(Boolean);
}

function bouncer(arr) {
  function isTruthy(arg) {
    return Boolean(arg);
  }

  var filteredArray = arr.filter(isTruthy);
  return filteredArray;
}

function bouncer(arr) {
    arr = arr.filter(function(element){
        return Boolean(element);
    });
  return arr;
}

Code Explanation:

The Array.prototype.filter method expects a function that returns a Boolean value which takes a single argument and returns true for truthy value or false for falsy value. Hence we pass the built-in Boolean function. The second solution replaces the array in-place, and utilises an anonymous function as the callback for the filter method. This avoids polluting the global scope with a single-use function, and makes our code more concise.

Credits:

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