Javascript incompatibility issue

JavaScript
1

I just completed a Rosetta Code challenge (ABC problem) which passes all the tests when I run it in VS Code but fails all the tests in online editor. Here’s the code I used:

function canMakeWord(word) {
  const availableBlocks = new Set(['BO','XK','DQ','CP','NA','GT','RE','TG','QD','FS','JW','HU','VI','AN','OB','ER','SF','LY','PC','ZM'])
  for (ch of word.toUpperCase()) {
    const block = [...availableBlocks].find(block => block.includes(ch));
    if (!block) return false; // Letter cannot be formed
    availableBlocks.delete(block); // Remove the used block 
  }
  return true; // All letters can be formed with available blocks
}

When I changed to use older style coding of loops, sets and searches, it passed all the tests.

Is it possible to configure Javascript to use all the modern features?

2

Have you looked at what is returned for one of the test cases?

console.log(canMakeWord("bark"))
3

Well, well - that revealed the problem: “ReferenceError: ch is not defined”. Adding let before ch of ... fixed it. It seems VS Code let me get away with it because I didn’t set “use strict”. Bad programmer! Thanks for the hint.