6 replies

Error concatenating strings in a for loop

Hello, I'm trying to generate a random string of length 12

  let id = '';

  for(let i = 0; i < 12; i++) {
    let randNum = Math.floor(Math.random() * (128 - 21) + 21);
    let char = String.fromCharCode(randNum);
    id += char;
  }

  let id = '';

  for(let i = 0; i < 12; i++) {
    let randNum = Math.floor(Math.random() * (128 - 21) + 21);
    let char = String.fromCharCode(randNum);
    id += char;
  }

What I'm trying to do is, first, generate a random character, using the ASCII table starting at 21 till 127. Then with the String.fromCharCode, I get the character equivalent of the number generated.

The idea is that, I have an empty string and I use the += operator to concatenate whatever char I get from the loop, easy peasy lemon squeezy, nothing out of the ordinary, BUT, and this may be a conceptual mistake, when I run this code I get a reference error saying that

id has already BEEN DECLARED

id has already BEEN DECLARED

but I don't see myself redeclaring it so I don't understand.

Also, I've tried with the .concat method and it still gives the same result. Using const doesn't work either.

KP-C

Kevin Powell - Community•4y ago•

6 replies

Alex Mason

Error concatenating strings in a for loop

Hello, I'm trying to generate a random string of length 12

  let id = '';

  for(let i = 0; i < 12; i++) {
    let randNum = Math.floor(Math.random() * (128 - 21) + 21);
    let char = String.fromCharCode(randNum);
    id += char;
  }

  let id = '';

  for(let i = 0; i < 12; i++) {
    let randNum = Math.floor(Math.random() * (128 - 21) + 21);
    let char = String.fromCharCode(randNum);
    id += char;
  }

id has already BEEN DECLARED

id has already BEEN DECLARED

but I don't see myself redeclaring it so I don't understand.

Also, I've tried with the .concat method and it still gives the same result. Using const doesn't work either.

Error concatenating strings in a for loop

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