for loops in Zig

for walks elements; add 0.. and it hands you the index too.

const std = @import("std");

pub fn main() void {
    const temps = [_]i32{ 61, 68, 74, 79 };

    // for walks the elements; adding 0.. pairs each with its index.
    for (temps) |t| {
        std.debug.print("{d} ", .{t});
    }
    std.debug.print("\n", .{});

    for (temps, 0..) |t, day| {
        std.debug.print("day {d}: {d} F\n", .{ day + 1, t });
    }
}

How it works

for (temps) |t| captures each element between the pipes.
for (temps, 0..) |t, day| iterates the array and a counter in lockstep.
There is no C-style for — ranges and slices are the only things to walk.

Keywords and builtins used here

const
fn
for
i32
pub
void

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Type this snippet

Step 3 of 3 in Control flow, step 6 of 27 in Language basics.

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