I have an array and simply want to get the element at index 1.
var myValues = new Array();
var valueAtIndex1 = myValues.getValue(1); // (something like this)
How can I get the value at the 1st index of my array in JavaScript?
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8 Answers
You can access an element at a specific index using the bracket notation accessor.
var valueAtIndex1 = myValues[1];
On newer browsers/JavaScript engines (see browser compatibility here), you can also use the .at() method on arrays.
var valueAtIndex1 = myValues.at(1);
On positive indexes, both methods work the same (the first one being more common). Array.prototype.at() however allows you to access elements starting from the end of the array by passing a negative number. Passing -1 will give the last element of the array, passing -2 the second last, etc.
See more details at the MDN documentation.
3 Comments
Tho.Tra
This returns the element at the second index not at the "1st" as specified in the question.
nCardot
The question says "get the element at index 1". Index 1 is the second element in the array.
nCardot
I don't think indexer is an official term.. correct me if I'm wrong
Array indexes in JavaScript start at zero for the first item, so try this:
var firstArrayItem = myValues[0]
Of course, if you actually want the second item in the array at index 1, then it's myValues[1].
See Accessing array elements for more info.
Comments
You can just use []:
var valueAtIndex1 = myValues[1];
Comments
indexer (array[index]) is the most frequent use. An alternative is at array method:
const cart = ['apple', 'banana', 'pear'];
cart.at(0) // 'apple'
cart.at(2) // 'pear'
If you come from another programming language, maybe it looks more familiar.
1 Comment
nCardot
Looks like the at method is very new/currently a proposal. It works in Chrome DevTools but not Edabit. github.com/tc39/proposal-relative-indexing-method
Update 2022
With ES2022 you can use Array.prototype.at():
const myValues = [1, 2, 3]
myValues.at(1) // 2
at() also supports negative index, which returns an element from the end of the array:
const myValues = [1, 2, 3]
myValues.at(-1) // 3
myValues.at(-2) // 2
Read more: MDN, JavascriptTutorial, Specifications
Comments
shift can be used in places where you want to get the first element (index=0) of an array and chain with other array methods.
example:
const comps = [{}, {}, {}]
const specComp = comps
.map(fn1)
.filter(fn2)
.shift()
Remember shift mutates the array, which is very different from accessing via an indexer.
Comments
As you specifically want to get the element at index 1. You can also achieve this by using Array destructuring from ES6.
const arr = [1, 2, 3, 4];
const [zeroIndex, firstIndex, ...remaining] = arr;
console.log(firstIndex); // 2
Or, As per ES2022. You can also use Array.at()
const arr = [1, 2, 3, 4];
console.log(arr.at(1)); // 2
Comments
- your_array[0]
- your_array?.[0] (with NPE check)
