#Functions in Rust
Functions in rust begin with the fn keyword, followed by the function name, arguments, a return type if the function has one, and then the code block.
fn functionName(argument1: i32, argument2: i32) -> bool {
// Function code here
}
In the above function, the name is functionName, it has two arguments of the type i32 and returns a bool. Note that return types are signified after the -> operator.
If there is no return value, you can omit the type altogether, but if there are no arguments, you must still list parentheses:
fn functionNameTwo() {
// Function code here
}
To follow in last lesson's path, let's rewrite our loop in to a function:
fn divisible_by_three_between(min: i32, max_exclusive: i32) {
for x in min..max_exclusive {
if x % 3 == 0 {
println!("{} is divisible by 3", x);
}
}
}
In this example, we receive two 32 bit integers, i32, which are the min and max (exclusive) of the range we want to check. Then we use a for-in loop with the two inputs and check each value in the range if it is evenly divisible by three and print a statement accordingly.
Calling this function is as easy as :
divisible_by_three_between(1,101);