FizzBuzz (the Classic Practice Problem)

In this lesson you'll tackle FizzBuzz, the classic programming-learning problem, to deepen your understanding of conditionals. This is for people searching "JavaScript FizzBuzz solution" who landed here.

FizzBuzz is a classic programming-learning problem. You print numbers in order starting from 1, but print "Fizz" instead for a multiple of 3, "Buzz" instead for a multiple of 5, and "FizzBuzz" instead for a multiple of both. It's perfect practice for conditionals, and it's well known as the first exercise tackled in many introductory programming books and training courses.

The sample code loops from 1 to 15 with a for statement, performing three kinds of checks with if / else if. The key point is that the check for "a multiple of 15 (a multiple of both)" is written first — if you check for multiples of 3 first instead, 15 would be shown as "Fizz" rather than "FizzBuzz."

Simple as it is, getting the order of conditions wrong means it won't work correctly, which is why this problem is often used in interviews and training to check someone's grasp of programming fundamentals. It's known as a kind of rite-of-passage problem that comes up often even in someone's very first programming interview. It's also good practice for internalizing how the remainder operator % works.

Similar rule-based decision logic applies in real projects too — calculating discount conditions, judging a game score, and more. It looks like a simple problem, but it's a subject well suited to testing your computer-science fundamentals — the skill of correctly designing the order of conditionals.