Access to ES6 array element index inside for-of loop

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Use Array.prototype.keys:

for (const index of [1, 2, 3, 4, 5].keys()) {
  console.log(index);
}

If you want to access both the key and the value, you can use Array.prototype.entries() with destructuring:

for (const [index, value] of [1, 2, 3, 4, 5].entries()) {
  console.log(index, value);
}

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