Do-While Loop

Similar to the while loop, the do-while loop is a type of loop in JavaScript that allows you to execute a block of code repeatedly until a certain condition is met.

However, unlike the while loop, the do-while loop guarantees that the code block is executed at least once before the condition is checked. This means that even if the condition is false from the start, the code block will still run once before the loop exits.

The syntax for a do-while loop is:

while vs do-while

Both loops are used to execute a block of code repeatedly until a certain condition is met. However, they have a few differences in how they work:

• The while loop first checks the condition, and then executes the code block only if the condition is true. If the condition is false from the start, the code block won't be executed at all.
• The do-while loop executes the code block first, and then checks the condition. This means that the code block is always executed at least once, even if the condition is false from the start.

Here's an example to illustrate the difference:

In this example, the while loop won't execute the code block at all, because i is not greater than 0 from the start. On the other hand, the do-while loop will execute the code block once, even though i is not greater than 0 from the start.

So, when to use which loop? In general, you can use a while loop when you want to repeat a block of code only if a condition is true from the start. Use a do-while loop when you want to make sure that a block of code is executed at least once, even if the condition is false from the start.

In the exercise below, drag and drop the correct words to complete the sentences about the loops.