In this tutorial you learn The If Statement, The While Statement, The For Statement, The switch statement….
See syntax of The If … else, The Conditional Operator, The While loop, The Do ... While, The For loop, The For ... in loop and The Switch statement .
For loop Example
How to write a for loop. Use a For loop to run the same block of code a specified number of times.
Looping through HTML headers Example
How to use the for loop to loop through the different HTML headers.
How to write a while loop. Use a while loop to run the same block of code while a specified condition is true.
Do while loop Example
How to write a do...while loop. Use a do...while loop to run the same block of code while a specified condition is true. This loop will always be executed once, even if the condition is false, because the statements are executed before the condition is te
There are two special statements that can be used inside loops: break and continue.
Break statement Example
Use the break statement to break the loop.
Continue statement Example
Use the continue statement to break the current loop and continue with the next value.
The Array object is used to store a set of values in a single variable name.
Create an array Example
Create an array, assign values to it, and write the values to the output.
Join two arrays: concat() Example
How to use the concat() method to join two arrays.
Put array elements into a string: join() Example
How to use the join() method to put all the elements of an array into a string.
Literal array: sort() Example
How to use the sort() method to sort a literal array.
How to use the sort() method to sort a numeric array.
Arrays are one way of keeping a program more organized. They allow you to do some things that are difficult without them. Arrays are usually a group of the same variable type that use an index number to distinguish them from each other.
Associative arrays give you another way to store information. Using associative arrays, you can call the array element you need using a string rather than a number, which is often easier to remember. The downside is that these aren't as useful in a loop b
Loops, Versions, navigator Object
A repeat loop cycles though a group of statements until some condition is met. For instance, you can use a repeat loop to cycle though an array and print it to the screen. Or, you might want to cycle though the Array and look for some specific information
The use of an array is a fundamental programming concept in virtually all programming languages, although the actual implementation differs greatly among languages…
Functions, or procedures as they are called in some languages, provide a fundamental building block for virtually every programming language. The purpose of a function is to encapsulate the ability to perform a given task into a single set of code and to
Arrays and HTML Code
The file which does all the work in this slide show is slide-showNavigator.htm. To move pages around, we must first catch our pages ... and in this case we catch them in an array. We use two arrays: One to hold the URLs and another to hold the description
In general, you use For loops when you know how many times you want to perform a loop. Use While loops when you are not sure how many times you want to perform a loop. In this example we will look at a For loop.
This example looks at the While loop. Remember that usually you use For loops when you know how many times you want to perform a loop and While loops when you are not sure how many times you want to perform a loop. This sample will break the rule! We're d
Imagine that you wanted a script to perform the same routine over and over again 50 times in a row…
When working with more complex scripts you might face a situation in which you would have many more or less similar variables...
Counting and Looping
Some of the assignments the browser will need to perform on your code consist of executing a portion of code over and over again until an intermediate condition occurs.
Introduction to Loops
Sometimes you want to do the same thing more than once. Let's say, for example, that you wanted to get a password from somebody and you wanted to keep asking until they gave you the right password. If you just wanted to give them two tries, you could do s
Here we define the password as a string, and we declare a variable called answer. You'll see why we had to declare answer in a second. The next few lines are the important ones…
More about While Loops
In this tutorial you learn a Loop with in a Loops (Nested Loops)…
Arrays are lists. You might have a list of URLs that you want to visit, a list of names that you want to remember, or a list of colors in which you'd like text displayed. All these lists can be stored in arrays.
Arrays and Loops
Arrays are great, because you can loop through each element of the array and do something with it.
Arrays in the Document Object Model
This example is going to use image swapping to show how arrays are woven into the DOM…
Loops are used to repeat a process or section of code a specified number of times. There are three types of loop statements: for, while, and do while.
You can also nest for statements to obtain greater control and add a variety of tasks. Try this one and see what happens…
The while statement
A while statement is good for short comparisons. It will continue to repeat until the comparison is false. Unlike the for statement, it does not create its own variable. It must use an existing one from the main script…
In the construction of a dense array, the array constructor and all the array's elements are contained on one line…
Select Menus: The Options Array and SelectedIndex Property
In this example, we are using parallel arrays to power an HTML select menu for navigation. The simple HTML menu and its code is as follows…
The For Loop and The Break Keyword
Using for loops, we've shortened the long arrays from 24 or 60 lines each to 4 lines each. Our time script has been shortened by about 140 lines…
Looping Through the Forms and Elements Array
Looping through Radio Buttons / The Checked Property
In order to find which radio button within a group has been checked, you must loop through the entire group.
The while loop is much simpler than the for loop. It consists of a condition and the statement block.
An array can be regarded as a set of variables. This does not mean that the variables in an array are related to each other; they are still separate entities in themselves…
In the same way that arrays contain integers or strings as values, multidimensional arrays contain arrays as their values. The syntax for a multidimensional array is as follows…
Begin by adding the following block of code to your text editor…
The question now is, how do we ensure that each image is associated with the correct link? Simple, we use another set of arrays to hold each of the links…
Arrays are very important. Just think of an example where you want to store 100 different names…
A loop is a repeated execution of a series of steps as long asa agiven ccondition is satisfied…
Sometimes you want to break out of a control statement early, perhaps because of an error or some other condition that the conditional expression itself is not testing for. We have seen an example of this already with the break statement used in a switch
An array is a composite data type that stores a collection of values. These values can then be referenced by an index number…
Working with Arrays
You access elements of the array by using the array name followed by square brackets, aName[iNum]. The square brackets contain the number of the array element to be referenced…
There are three ways of defining an array…
Understanding and implementing arrays
So what are arrays? Well, they are an alternative way of defining variables that allow multiple variables to be quickly declared, painlessly…
The "for" loop
So far we have looked at statements that are run in sequence or where a selection is made as to which of several statements is to be run…
Even easier to use than the for loop is the while loop. A while loop doesn't initialize or increment any fields automatically as part of the command, it just tests a condition and executes the loop for as long as the condition remains true.
The for statement creates a loop consisting of three optional expressions enclosed in brackets and separated by semicolons, and a block of statements to be executed…
An array is an ordered set of values grouped together under a single variable name created by using an Array object constructor…
Arrays are variables, which can contain multiple values. The difference is that it is only “one” array, which will store these values. If you needed to store multiple values in normal variables, then you would have to define multiple variables…
The Array object contains 10 functions. In this section you will see these 10 functions in some small examples. Please refer to the array object, if you need more details about it. All functions are used with the array object…
Loops can be used to repeat something again and again till a condition returns false or true depending on how you need it. Lets imagine a loop in a real life…
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