JS Built-ins
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ArrayArray.prototype.entriesbeginner

Array.prototype.entries() — convert to array

📖 Usage Example
const arr = ['a', 'b', 'c']
const iter = arr.entries()
iter.next().value  // → [0, 'a']
iter.next().value  // → [1, 'b']

Use entries() to get an iterator of [index, value] pairs from an array.

Array.prototype.entries()

Array.prototype.entries() returns an iterator of [index, value] pairs for every element. You must consume the iterator — for example with Array.from() — to get a plain array.

Challenge: Implement getEntries(arr) that converts arr.entries() to a regular array of [index, value] pairs using Array.from().

getEntries(['a', 'b', 'c']) // → [[0, 'a'], [1, 'b'], [2, 'c']]
getEntries([])              // → []
💡 Hints (2)
  • • `arr.entries()` returns an iterator — wrap it with `Array.from()` to get a regular array.
  • • Each yielded value is a `[index, element]` tuple.