Language basics — Nyra Docs

let and let mut

let is immutable. Use let mut to change the value.

fn main() {
    let name = "Sam"
    let mut score = 0
    score = score + 10
    print(score)
}

fn main() -> void {
    let name: string = "Sam"
    let mut score: i32 = 0
    score = score + 10
    print(score)
}

Output

print writes to the terminal with a newline after each call.

fn main() {
    print("Hello, Nyra!")
    print(42)
}

fn main() -> void {
    print("Hello, Nyra!")
    print(42)
}

Output

Hello, Nyra!
42

Branch execution on a boolean condition.

fn main() {
    let n = 7
    if n > 5 {
        print("big")
    } else {
        print("small")
    }
}

fn main() -> void {
    let n: i32 = 7
    if n > 5 {
        print("big")
    } else {
        print("small")
    }
}

Output

big

for over a numeric range; while while the condition is true.

fn main() {
    for i in 0..3 {
        print(i)
    }
    let mut n = 0
    while n < 2 {
        print(n)
        n = n + 1
    }
}

fn main() -> void {
    for i in 0..3 {
        print(i)
    }
    let mut n: i32 = 0
    while n < 2 {
        print(n)
        n = n + 1
    }
}

Output

Define a function with parameters and call it from main.

fn add(a, b) {
    return a + b
}

fn main() {
    print(add(2, 3))
}

fn add(a: i32, b: i32) -> i32 {
    return a + b
}

fn main() -> void {
    print(add(2, 3))
}

Output