Learning Zig from the official language reference.
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const std = @import("std");
const testing = std.testing;
fn getNumber(b: bool) ?i32 {
return if (b) 42 else null;
// orelse is a simple way of providing a default value for an optional type
test "orelse" {
const true_res = getNumber(true) orelse 0;
testing.expectEqual(true_res, 42);
const false_res = getNumber(false) orelse 0;
testing.expectEqual(false_res, 0);