JavaScript Tutorial 6 - While Loops

In JavaScript While Loops can execute a block of code as long as a specified condition is true. So as long as your condition is true the block of code will keep looping until your condition is false. They syntax looks like this...

while(condition)
{
block of code to be looped
}

This is very simple, now to get a more complex take on while loops, this will look something like this...

var x = 4;

while( x == 4)
{
alert("loop")
x = 5
}

This code will run the alert statement once, because I added in the x = 5, which makes the condition false and will stop the loop. Its very important to have a way for the condition to become false or else it will create an infinite loop and crash your browser.You can also do something like this...


while (i<5)  {  x=x + "The number is " + i + "<br>";  i++;  }

This code will spit out 5 different alerts by using the "++" statement which just increase the value of a variable by 1. This is the basics of how while loops work in JavaScript.