All iterables have the built-in
entries
iterator that
allows you to iterate over
key-value pairs. Let's test it
on an array:
let arr = ['a', 'b', 'c'];
We get an iterator:
let iter = arr.entries();
And loop through it:
for (let entry of iter) {
console.log(entry); // [0, 'a'], [1, 'b'], [2, 'c']
}
Let's perform destructuring during iteration:
for (let [key, value] of iter) {
console.log(key); // 'a', 'b', 'c'
console.log(value); // 0, 1, 2
}
Test the work of this iterator
on a Map
collection.
Test the work of this iterator
on a Set
collection.
Test the work of this iterator
on a NodeList
collection.