Ctrl / ⌘ + drag to orbit · Ctrl / ⌘ + scroll to zoomDrag to orbit · Pinch to zoom

LESSON 5.12

Parameters Are Read-Only

A function cannot reassign its parameter. Return the changed value, then let the caller store it.

Goal Make add_one return the increased value and print 2 .

Write a Zirk program, then run it to see the world react.

Your code

main.zirk

Zirk syntax highlighting active

Lesson scaffold is locked. Edit the learner region.

Zirk

import { stdout } from std.io;

fn add_one(n: Int32): Void {
    n += 1;
}

fn main(): Void {
    mut v = 1;
    add_one(v);
    stdout.println(v);
}

⌘ / Ctrl + Enter

Your program output will appear here.

Sound unavailable in this browser