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Gilbert Joseph Smith III

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Details

• Difficulty: 1/5

Remove all falsey values from an array.

Falsey values in javascript are false, null, 0, "", undefined, and NaN.

Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Useful Links

• Boolean Objects
• Array.filter()

Problem Script:

function bouncer(arr) {
  // Don't show a false ID to this bouncer.
  return arr;
}

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

Explanation:

Falsey values in javascript are false, null, 0, "", undefined, and NaN. Everything else is basically truthy. So if we find any falsey we have to filter then out.

Hint: 1

Filter() requires a callback function, you need to create it.

Hint: 2

You will return a boolean of the argument from the callback function, use Boolean(arg)

Hint: 3

If you figure out how to use filter and boolean then you are all set, if not then keep checking for the answer.

My code:

function bouncer(arr) {
  function isTruthy(arg){
    return Boolean(arg);
  }
  var filteredArray = arr.filter(isTruthy);
  return filteredArray;
}

My Code Explanation:

• Create a callback function that returns a boolean using the argument passed to it.
• use that call back function with filter to filter the array and return the filtered array.

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