Switch

Zig’s switch works as both a statement and an expression. The types of all branches must coerce to the type which is being switched upon. All possible values must have an associated branch - values cannot be left out. Cases cannot fall through to other branches.

An example of a switch statement. The else is required to satisfy the exhaustiveness of this switch.

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const expect = @import("std").testing.expect;

test "switch statement" {
    var x: i8 = 10;
    switch (x) {
        -1...1 => {
            x = -x;
        },
        10, 100 => {
            //special considerations must be made
            //when dividing signed integers
            x = @divExact(x, 10);
        },
        else => {},
    }
    try expect(x == 1);
}

Here is the former, but as a switch expression.

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const expect = @import("std").testing.expect;

test "switch expression" {
    var x: i8 = 10;
    x = switch (x) {
        -1...1 => -x,
        10, 100 => @divExact(x, 10),
        else => x,
    };
    try expect(x == 1);
}