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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/NodeList/keys below:

NodeList: keys() method - Web APIs

Baseline Widely available

The NodeList.keys() method returns an iterator allowing to go through all keys contained in this object. The keys are unsigned integer.

None.

Returns an iterator.

const node = document.createElement("div");
const kid1 = document.createElement("p");
const kid2 = document.createTextNode("hey");
const kid3 = document.createElement("span");

node.appendChild(kid1);
node.appendChild(kid2);
node.appendChild(kid3);

let list = node.childNodes;

// Using for...of
for (const key of list.keys()) {
  console.log(key);
}

The result is:

0
1
2

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