Credit Card Checker

Get Help JavaScript
#1

Hi,

I am stuck in the creditcard checker. I don’t know where to start and it’s overwhelming. I am trying out some things and I know I need to use: reverse(), a for loop and if statement. Can someone help me with this?

Ofcourse I can search the forum for solutions but then I still don’t get it and someone else’s code is overwhelming to me. :relaxed:

This is what I have for now.

const validateCred = (valid1) => {
  let array = valid1;
  let reversedArray = array.reverse();
  for(i = 0; i <= reversedArray.length; i++) {
    if(i === i *= 2) {
      return ...;
    } else {
      return 'Invalid'
    }
   }
};

console.log(validateCred());

Thank you in advance.

Rosita

#2

Hi,

This statement will cause issues:

if(i === i *= 2)

since you’re trying to do two things at once (comparison and assigment). Just remember that i *= 2 means that you want i assigned a new value that is itself multiplied by 2.

With loops it’s always useful to have console.logs to explicit track what’s going on inside the loop.

#3

I’ve just completed this task yesterday so its still fresh in my mind.

Personally i’ve done 2 for loops
eg
1st loop may start… i=0 and increases by i+=1 (that means it will skip one element then iterate the next.
2nd loop will start i=1 and again increase i+=1
the order the elements will be different but I don’t see (and it didn’t) effect the final results.

let me know if you want me to share that part of my code. It’s a little different but I’m sure you’ll see it :smiley: