JavaScript Array Object
The Array object is used to store a set of values in a single variable name.
Examples
Create an array
Create an array, assign values to it, and write the values to the output.
For...In
Statement
How to use a for...in statement to loop through the elements of an array.
Join two
arrays - concat()
How to use the concat() method to join two arrays.
Put array
elements into a string - join()
How to use the join() method to put all the elements of an array into a string.
Literal array
- sort()
How to use the sort() method to sort a literal array.
Numeric array
- sort()
How to use the sort() method to sort a numeric array.
Complete Array Object Reference
For a complete reference of all the properties and methods that can be used with
the Array object, go to our
complete Array object reference.
The reference contains a brief description and examples of use for each
property and method!
Defining Arrays
The Array object is used to store a set of values in a single variable name.
We define an Array object with the new keyword. The following code line
defines an Array object called myArray:
There are two ways of adding values to an array (you can add as many values
as you need to define as many variables you require).
1:
var mycars=new Array();
mycars[0]="Saab";
mycars[1]="Volvo";
mycars[2]="BMW";
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You could also pass an integer argument to control the array's size:
var mycars=new Array(3);
mycars[0]="Saab";
mycars[1]="Volvo";
mycars[2]="BMW";
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2:
var mycars=new Array("Saab","Volvo","BMW");
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Note: If you specify numbers or true/false
values inside the array then the type of variables will be numeric or Boolean instead
of string.
Accessing Arrays
You can refer to a particular element in an array by referring to the name of
the array and the index number. The index number starts at 0.
The following code line:
document.write(mycars[0]);
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will result in the following output:
Modify Values in Existing Arrays
To modify a value in an existing array, just add a new value to the array
with
a specified index number:
Now, the following code line:
document.write(mycars[0]);
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will result in the following output:
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