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

NodeList: item() method - Web APIs

NodeList: item() method

Baseline Widely available

Returns a node from a NodeList by index. This method doesn't throw exceptions as long as you provide arguments. A value of null is returned if the index is out of range, and a TypeError is thrown if no argument is provided.

In JavaScript, instead of calling nodeList.item(index), you can also access the index directly, like nodeList[index].

Syntax Parameters
index

The index of the node to be fetched. The index is zero-based.

Return value

The indexth node in the nodeList returned by the item method.

Exceptions
TypeError

Thrown if no argument is provided.

Examples
const tables = document.getElementsByTagName("table");
const firstTable = tables.item(1); // or tables[1] - returns the second table in the DOM
Specifications Browser compatibility

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