Summary
let i = 0;
do {
// Insert code here
i++;
} while (i < 10);Details
A do…while loop allows you to easily repeat a block of code multiple times.
In a do…while loop, the statement inside the do block will be executed at least once. This is different from a normal while loop. In a normal while loop, it’s possible that the block of code never gets executed at all.
To write a do…while loop, first declare your counter variable. Unlike a for loop, you declare your counter outside of the loop.
let i = 0;Next, write the skeleton of the do…while loop.
let i = 0;
do {
} while ();Next, add the test condition inside the parentheses.
let i = 0;
do {
} while (i < 10);Add an increment or decrement statement to the end of your loop. Without this, you might accidentally create an infinite loop!
let i = 0;
do {
i++;
} while (i < 10);Lastly, add the code you want to repeat.
let i = 0;
do {
console.log("Hello world");
i++;
} while (i < 10);Demo
Exercises
Try the following statements in the console:
let i = 0;
do {
console.log("hello world");
i++;
} while (i < 5);You should see ‘hello world’ print out 5 times, or the phrase ‘hello world’ with a number 5 next to it.
References
do...while statement on MDN