"Endless Cycle Dilemma" Enigma

Upon executing the function below, I encountered the following error:

"Error: Possible infinite loop."

The issue appears to stem from the use of "0" in the splice method, as changing it to any other number (1-9) eliminates the error.

I'm uncertain as to how this could result in an infinite loop.

Could it be that the "0" in the splice method is causing confusion with "i" or something else?

Any assistance would be greatly valued, thank you.

function spinalCase(str) {
  var array = str.split("");
  for (i = 0; i < array.length; i++) {
    if (array[i] !== array[i].toLowerCase()) {
      array.splice(i, 0, " ");
    }
  }
  return array;
}
spinalCase('AllThe-small Things');

Answer №1

array.splice(i, 0, " "); is used to add a new element at the current i index, causing the item previously at that index to shift up to i + 1. This can result in the same item being processed multiple times in a loop, leading to an endless insertion loop.

One way to address this is by incrementing i an extra time within the if block. Alternatively, looping backwards can also solve the issue:

function spinalCase(str) {
  var array = str.split("");
  for (i = array.length - 1; i >= 0; i--) {
    if (array[i] !== array[i].toLowerCase()) {
      array.splice(i, 0, " ");
    }
  }
  return array;
}
console.log(spinalCase('AllThe-small Things'));

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