FAQ: Arrays - Introduction

This community-built FAQ covers the “Introduction” exercise from the lesson “Arrays”.

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This exercise can be found in the following Codecademy content:

Learn TypeScript

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I was able to get past the first step, but with this code I keep getting a red X on the second step. I’ve compared it to the solution, and my code SHOULD work.

let customersArray = ['Custy Stomer', 'C. Oostomar', 'C.U.S. Tomer', 3432434, 'Custo Mer', 'Custopher Ustomer', 3432435, 'Kasti Yastimeur'];

//Write Your Code here:
function checkCustomersArray(){
  for (i in customersArray){
    let el = customersArray[i]
    if (typeof el != 'string'){
      console.log(`Type error: ${el} should be a string!`);


function stringPush(val){
  if (typeof val === 'string'){

Why isn’t it letting me pass through to the next step?

The solution is in :

  1. deleting let el…
  2. replacing el with customersArray[i]

also use the for loop, the exercises does not have the AI built-in to recognize that what you wrote does indeed work.
Cross check closely with the solution and you’ll see.