Zig by Example: For

For loops allow you to iterate over an array, slice, or tuple.
	const std = @import("std"); const print = std.debug.print;
	pub fn main() anyerror!void { var array = [_]u32{ 1, 2, 3 };
By default, for loops iterate by value, meaning that you cannot modify the loop’s payload (in this case, `elem`).	for (array) \|elem\| { print("by val: {}\n", .{elem}); }
To iterate by reference, prefix the payload’s name with a `*`. This will let you modify the captured value.	for (array) \|*elem\| { elem += 10; print("by ref: {}\n", .{elem}); }
To ignore a for loop’s payload, use `_`.	for (array) \|_\| {}
To access a for loop’s index, use the `\|PAYLOAD, INDEX\|` syntax.	for (array) \|elem, i\| { print("{}: {}\n", .{ i, elem }); } }

$ zig run for.zig
by val: 1
by val: 2
by val: 3
by ref: 10
by ref: 20
by ref: 30
0: 10
1: 20
2: 30