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javascript loop through array :

By ruining JavaScript through Array can export every data present inside that array without declaring/printing the value multiple time.
Using array we can print or Export every Value that's stored inside that Array by declaring once inside single Loop.
if we have array of 2 to 10 values then we can easily print each value by declaring print statement/method for each (2-10) values.


    var myArray=["value1","value2"];
    document.write(myArray[0]);
    document.write(myArray[1]);

But if we have huge amount of value like 100 plus values inside one or more then one array then its became too hard to print every value by declaring print method for each array value. in those cases array saves out time.
But before Looping array data we have to know about JavaScript loops and JavaScript arrays.

Full Tutorial about JavaScript Arrays
Full Tutorial about JavaScript Loops

JavaScript Arrays :

Array is a Special variable in JavaScript who can store multiple Values inside a single VAriable and call any Variable's value by its index Number.

Storing Values inside JavaScript Arrays :

To store values inside we have to write our values (numeric or string) between Box brackets [ ] and and separates values using comma ,.

Calling Array Values :

To call array values we have to write our name inside JS write method .write(myArray); to print All values present inside a Array, and if we want to print a single value from any JS array then we can call that value using it's index number myArray[0].

Array in JavaScript :


    var myArray=["value1","value2"];
    document.write(myArray);    
    document.write(myArray[1]);

JavaScript Loops :

Loops are used in JavaScript to perform a Task Continuously without Declaring That task multiple times. Loops can run a task multiple time or According to Given conditions. So there 3 Different Loops in JavaScript Like : 1. While Loop, 2. Do while Loop, 3. For Loop.
Note : in this tutorial we are only going to use for loop to print array value, but if you want to know about other while and do while loops also then you can check my Full Tutorial by clicking here about JavaScript Loops.

For Loop :

In for Loop out program will check the Condition first so if the given Condition is True the out program will precess our given statement/code declared inside for loop and if Condition is False the program will skip the Statement/code declared inside for loop and returns the Value.
in for loop we have to define 3 things
1.init,
2.condition,
3.and increment or decrement.
Note : we will understand these things after the Last Example (javascript loop through array Example).

for Loop JavaScript

for Loop Syntax


    for(init,condition,increment){
      statement.....
    }   

For Loop Example


<html>
 <head>
  <title>For Loop Example </title>
 </head>
 <body>

   <script type="text/javascript">
   
   for(var num=1; num<=5; num++){
   
   document.write(num+"<br/>");

   }

   </script>

 </body>
</html>	

Results

javaScript loop through array:

javaScript loop through array is a process to print/Export or Process Array's data using Loop. So we can declare our array once inside a loop and export every data present inside that Array.

javaScript loop through array Example :

javaScript loop through array Example :


<html>
 <head>
  <title>For Loop Example </title>
 </head>
 <body>

   <script type="text/javascript">

   var myArray=["cat","dog","cow","rat","parrot","rabbit","snake"];
   
   for(var indNo=0; indNo < myArray.length; indNo++){
   
   document.write(myArray[indNo]+"<br/>");

   }

   </script>

 </body>
</html>	

javaScript loop through array Results

Example Explained :

script tag <script> :

Script tag used inside HTML Document to insert/Declare JavaScript code. and also using this <script;> tag we can include or link External .js file by using src="" attribute.

Variable var:

by using var we declare Variables inside JavaScript file/Code so we can store and call value from that variable name.

for Loop for(init;condition;increment){code..}

for loop used in Example to run our statement/code multiple times according to given Condition.

var indNo=0:

Here inside for loop we have Declared a Variable using var called indNo (IndexNumber) and assign 0 as its value. Because we are going to use this Variable at the place of Array's index number.

indNo<myArray.length

using indNo<myArray.length inside for loop we have set our Condition for that loop, where myArray.length will get the Array's value Length from the Array Named myArray and return the total length of values inside that Array. and whole condition will be true until variable indNo is less then myArray.length array Length.

indNo++

this ++ Concatenation method will increment the Variable's (indNo) value by one every time after Condition return true and Executes the Statement.
That will assign index number index number 0 to 6 to Array at document.write() statement.

document.write(myArray[indNo]+"<br/>")

document.write() method will print the value in the Output screen , where given values are myArray[indNo]+"<br/> which mean myArray[indNo] will print the value of Array at index number of indNo variable value, which will change according to for loop Condition, + will concatenate/join our string value ("<br/>) with out variable (a) and "<br/>" will add a line break after each array Values in the Output.

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