An array object is an element used to bundle multiple unnamed values into a single item.
A pair of square brackets (
Let's discuss some examples of an array object.
Example 1: An array with two unnamed values
Above is an array object containing two unnamed values.
Example 2: An array with four unnamed values
let number = "Seventy";
let name = "Peter";
let state = true;
[number, name, state, undefined]
In the snippet above is an array object containing four unnamed values.
Let's now discuss how to access the content of an array object.
How to Access an Array Object's Value
You cannot access the content of an array object unless you put it in a variable and invoke it through the variable's name.
Once you've kept your array in a variable, you can use the square bracket notation to access the array's value.
Here's the syntax:
In the snippet above,
variableName references the name of the variable containing your array.
On the other hand,
index refers to the position of items in an array object.
Array's indexing starts at zero. In other words, the index of an array's first item is
0. The second value's index is
1. And the last item's index is the array's
For instance, consider this array object:
["Blue", "White", "Pink", "Green"]
Here are the index positions of the array items above:
- Blue is at index 0
- White's index position is 1
- Pink's index is 2
- Green's index position is 3
To access any value in the snippet above, you must put the array in a variable like so:
// Define an array object and assign it to a variable:
const colors = ["Blue", "White", "Pink", "Green"];
// Invoke the color array's second index item:
// The invocation above will return:
colors code in the snippet above instructs the computer to get the
color array's second index value.
In other words, behind the scenes,
Blue's name is
Green's name is
So, technically, all array items have names.
The square bracket notation is the only way to access any property whose name is a number. Therefore, you can use only the square bracket notation—not the dot syntax—to access an array's value.
Important Stuff to Know about an Array Object
Keep these six essential pieces of info in mind whenever you choose to use an array object.
shift()method to remove an array's first item.
- To remove an array's last element, use
- Suppose you wish to copy part of an array without modifying it. In that case, use
- To add or remove an item at any index position, use the
- You can use
lengthproperty to add new items to the end of an array object.
- Use unshift() to add new items to the beginning of an array object.
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