Missing letters Intermediate Algorithms

JavaScript
1

I just completely my Missing Letters but I just can’t get the last case. Can you see a bug?

function fearNotLetter(str) {
  let alpha = 'abcdefghijklmnopqrstuvwxyz';
  let range = alpha.slice(alpha.indexOf(str[0]), str.length + 1)
                   .split('')
                   .filter(value => !str.includes(value));
  return range[0];
}

I understand I didn’t do the indented solution of comparing the ASCII code but this example works for all but ‘stvwx’ for some reason.
Thank You.

Challenge Link

2

Try to temporarily split it more into steps and see if at each step everything looks like it should.

3

I broke up your code into smaller pieces to let you see what is happening.

function fearNotLetter(str) {
  let alpha = 'abcdefghijklmnopqrstuvwxyz';
  console.log('alpha.indexOf(str[0]) = ' + alpha.indexOf(str[0]));
  console.log('str.length + 1 = ' + (str.length + 1));
  let slice = alpha.slice(alpha.indexOf(str[0]), str.length + 1);
  console.log('slice = ' + slice);
  let rangeArr = slice.split('');
  console.log(rangeArr);
  let range = rangeArr.filter(value => !str.includes(value));
  console.log('range = ' + range);
  return range[0];
}
console.log(fearNotLetter("stvwx")) // undefined
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4

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