Zig by Example: Assignment

In Zig, values can be assigned to constants or variables.

 
const std = @import("std");
 
pub fn main() anyerror!void {

Here, we assign the value true to the bool constant c. Constants are immutable, so the value of c cannot change.

 
    const c: bool = true;

Here, we assign the value false to the bool variable v. Variables are mutable, so the value of v can be re-assigned.

 
    var v: bool = false;
    v = true;

Note that the compiler can often infer types for you.

 
    const inferred_c = true;
    var inferred_v = true;

To create an uninitialized constant or variable, assign undefined to it. Note that you need type annotations here.

 
    const undefined_c: bool = undefined;
    var undefined_v: bool = undefined;

Assignments can also be used to ignore expressions.

 
    _ = c;
    _ = v;
    _ = inferred_c;
    _ = inferred_v;
    _ = undefined_c;
    _ = undefined_v;
}

Next example: Integers.

by Jason Phan | source | license