Rust Quick Start Guide

while loops

A while loop is a lot like an if expression. The difference is, instead of checking the condition expression once and then either running the block expression or not, and then being done, a while loop keeps repeating the process until the condition expression produces false. So, if the condition expression results in false right away, the block expression never runs. On the other hand, if the condition expression produces true on the first check, the block expression gets run, and then the condition expression is evaluated again. If it produces true again, the block runs again, and so on, until the condition expression finally produces false.

That means that it's very important for the block expression to change something that ...