Rust Quick Start Guide

Branch expressions

One of the things that makes programs truly useful is the ability for them to make decisions. We can do that in Rust by using an if expression. An if expression looks something like this:

if 3 > 4 {    println!("Uh-oh. Three is greater than four.");}else if 3 == 4 {    println!("There seems to be something wrong with math.");}else {    println!("Three is not greater than or equal to four.");};

If you're familiar with other programming languages, you might be wondering where the parenthesis are around the condition expression. Rust's syntax doesn't call for parenthesis there. In fact, if we place the condition in parenthesis, the compiler will warn us that they're not necessary.

What we have here is an expression that shows off all ...