How to Access Elements at Specific Indices in JavaScript Arrays?

Obtaining Values at Specific Array Indices in JavaScript

In JavaScript, you can efficiently retrieve elements at specific indices within arrays. Here's how:

Using Bracket Notation Accessor

The bracket notation accessor allows you to access array elements using the index as the key within brackets. For instance:

<code class="javascript">var myValues = new Array();
var valueAtIndex1 = myValues[1];</code>

Using the .at() Method (ECMAScript 2015)

Newer JavaScript engines support the .at() method on arrays, which provides an alternative way to access elements at specific indices. It works similarly to the bracket notation, but allows for negative indices:

<code class="javascript">var valueAtIndex1 = myValues.at(1); // Same as myValues[1]</code>

Positive Indices

For positive indices, both the bracket notation and .at() methods act identically.

Negative Indices

However, the .at() method adds functionality for negative indices. Passing -1 retrieves the last element, -2 gets the second-to-last element, and so on:

<code class="javascript">var lastElement = myValues.at(-1);</code>

MDN Documentation

Refer to the MDN documentation for more details on accessing array elements in JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at

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