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ARRAY
How to create array and add element
We can create arrays in JavaScript in
different ways. Handling of arrays using JavaScript is required in
many applications. If we are processing a form then elements of the
form can be managed as part of an array. We will learn some
different points on use of arrays and before that we will learn some
basics of JavaScript array.
How to create arrays in JavaScript?
We can declare an array like this
We can add elements to this array
scripts[1] = "ASP";
scripts[2] = "JavaScript";
scripts[3] = "HTML";
Now our array scrips has 4 elements inside it and
we can print or access them by using their index number. Note that
index number starts from 0. To get the third element of the array we
have to use the index number 2 . Here is the way to get the third
element of an array.
document.write(scripts[2]);
We also can create an array like this
var no_array = new Array(21, 22, 23, 24, 25);
Displaying all elements of an array
We can display all elements of an array by looping
through each element of the array. Here we will increment the index
of the array by one in each loop and display elements of the array
one by one. To identify how many loops we have to make we must know
the total number of elements present inside the array. That we can
find out like this
array_name.length
So this number we will set as upper limit of our
number of rotation or looping. You can check our tutorial on
creating array to create an array and now we will try to display
each element of the array. Here is the code.
var scripts = new Array();
scripts[0] = "PHP";
scripts[1] = "ASP";
scripts[2] = "JavaScript";
scripts[3] = "HTML";
for (i=0;i<scripts.length;i++)
{
document.write(scripts[i] + "<br >");
}
The for loop in the above code loops through the
elements of the array and display one by one vertically by adding
one line break at the end of each element. The upper limit of the
for loop is set to script.length value which is in this case equal
to 4