Docs / Tutorial

03 · Control flow

No parens on if/for. Loop and match ranges use :, including the start and excluding the end: [start, end). Statement-start -> is continue, <- is break.

Source

@main

fn main() int {
    age := 16
    if age >= 18 {
        println("adult")
    } else {
        println("minor")
    }

    match age {
        0:13 {
            println("child")
        }
        13:20 {
            println("teen")
        }
        else {
            println("adult")
        }
    }

    mut n := 3
    while n > 0 {
        println(n)
        n -= 1
    }

    mut sum := 0
    for i in 0:5 {
        if i == 2 {
            ->
        }
        if i == 4 {
            <-
        }
        sum += i
    }
    println(sum)
    << 0
}

Build (from the language repo root; swap the binary for your platform):

xu run examples/03_control_flow/main.xu
# or: xu build examples/03_control_flow/main.xu
# default artifact is ./main on mac/linux, ./main.exe on Windows

Run from the separate examples repository root; source files live under examples/.