Basic Algorithm Scripting - Falsy Bouncer

Code Feedback
1

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

/*function bouncer(arr) {
  let newArr = [];
  for (let i = 0; i <= arr.length; i++) {
    if (Boolean(arr[i]) == true) {
      newArr.push(arr[i]);
    }
  }
  return newArr;
}

bouncer([7, "ate", "", false, 9]);*/

function bouncer(arr) {
  const filteredArr = [];
  for (let i = 0; i < arr.length; i++) {
    if (arr[i]) filteredArr.push(arr[i]);
  }
  return filteredArr;
}

bouncer([7, "ate", "", false, 9]);

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Challenge: Basic Algorithm Scripting - Falsy Bouncer

Link to the challenge:

I do know that my commented out solution works so no problem with that.
I just cant wrap my head around how the sample solution checks if the values in array are falsy or not.
I do realize it happens in if statements (arr[i]) part but I don’t have the slightest idea how.
Does it call for some function that is out of our sight?
Is there some built-in functionality to check for booleans?
What is going on in the brackets? That makes no sense to me.

2

We have blurred this solution so that users who have not completed this challenge can read the discussion in this thread without giving away the solution.

3

If statement checks the condition and in this case the condition is arr[i]

So long as arr[i] is not a zero or any of the other falsy values, then the if will fire as anything other than those values is considered to be true.

4

what are you looking for is Boolean coercion

5

So you are saying that (arr[i]) is read as true or false depending what is stored in the [i].
For example, if (arr[i]) that has 1 stored in [i] would be read as if I had typed in if (true)? Following the same logic all the falsy values would be read as if (false).

Am I on the right track or?

6

Yes you are on the right track.

7

yes basically when the value in arr[i] is used in a contest when a boolean was expected, it is converted to a boolean, it can be a truthy or falsy value

8

I want to believe I got it down now.
Thank you a ton for both of you guys, especially you @dball!

2 Likes
9

ohh don’t worry it takes time for these stuff to sink in, anyway you are welcomed :+1:

10

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