Get the index in a JavaScript for-of loop

Nov 7, 2018

Learn how to get the index of the current iteration in a JavaScript for-of loop by calling the array entries() method with destructuring syntax.

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A for-of loop, introduced in ES6, is a great way to iterate over an array:

for (const v of ['a', 'b', 'c']) {
  console.log(v)
}

How can you get the index of an iteration?

The loop does not offer any syntax to do this, but you can combine the destructuring syntax introduced in ES6 with calling the entries() method on the array:

for (const [i, v] of ['a', 'b', 'c'].entries()) {
  console.log(i, v)
}

Tagged: JavaScript · All topics

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