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User at 1:20 pm, Jul 12, 2024

I want to loop through a string array in reverse order.

If the next string is equal to the previous string, I want to delete the next string.

I am starting from the end in the hopes that I don't skip any items, like this:

  let commandHistory = JSON.parse(localStorage.getItem(LogKeys.CommandHistory) || '[]')
    .filter((ch: string) => { return ch !== 'Return (ENTER)'; })
  let prevCommand = ''
  for (let i = commandHistory.length; i >= 0; i--) {
    if(commandHistory[i] === prevCommand) {
      commandHistory.splice(i, 1);
    }
  }

Is that right? Or should I delete the previous string?

Codeium at 1:21 pm, Jul 12, 2024

Your approach to loop through the array in reverse order to avoid skipping items when you delete them is correct. However, there's a small mistake in your loop condition and the logic for deleting duplicates. When looping through an array in reverse in JavaScript (or TypeScript), you should start your loop at commandHistory.length - 1 because array indices are zero-based. Ending the loop condition should be i >= 0 to ensure the first element is checked.

Additionally, you should update prevCommand with the current command at the end of each loop iteration to correctly compare each command with its successor. Here's the corrected version of your loop:

let commandHistory = JSON.parse(localStorage.getItem(LogKeys.CommandHistory) || '[]')
  .filter((ch: string) => ch !== 'Return (ENTER)');
let prevCommand = '';

for (let i = commandHistory.length - 1; i >= 0; i--) {
  if (commandHistory[i] === prevCommand) {
    commandHistory.splice(i, 1);
  } else {
    prevCommand = commandHistory[i];
  }
}

In this corrected version:

• The loop starts at commandHistory.length - 1 to correctly reference the last item in the array.
• After comparing commandHistory[i] with prevCommand, prevCommand is updated to commandHistory[i] when they are not equal. This step ensures that prevCommand always holds the last unique command you encountered while looping.
• This logic keeps the first occurrence of each command when multiple consecutive duplicates exist and deletes the subsequent ones, which matches your requirement.

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