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The do while loop is a variation of the while loop a do while loop will always execute the entire code

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block once before checking if a condition is met if the condition is met.

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After the first pass it will then loop the code block as long as the condition remains true.

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Let's take a look at an example to illustrate this on this page.

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We have a javascript function that's executed when a button is clicked we can see the on click event

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in our button element that triggers the function named my function the function in our javascript tag

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starts with defining a variable named ie with initial value of 0.

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Then we have the syntax for our do while loop this loop will start by outputting the value of IE in

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incrementing it by 1.

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It will continue to loop and increment as long as the value of AI is less than 10 we can see this condition

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defined in our while parameter.

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Let's click the button to see the result

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we can see the loop started zero because that's the initial value of AI the value of AIs then incremented

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it is incremented until the value of AI reaches 9 which is less than 10.

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Now let's see what would happen if we were to change the initial value of AI to eleven.

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We can see that the output is now eleven.

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This is because the loop executed once but it does not execute again because this condition is no longer

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met.

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After the first past.