Imprimindo com std.debug.print

Printing text is how you see what your code is doing. Zig's quickest way to do that is std.debug.print. 🖨️

The dots in std.debug.print are a path: the std module contains debug, which contains the print function you are calling.

print always takes two things: a format string and a tuple of values to fill into it. Even with no values, you pass an empty tuple.

That .{} is an empty tuple. When your text has no placeholders, you still supply it so the function signature is satisfied.

Inside the format string, {} marks a spot to drop in a value. Each placeholder pulls the next item from your argument tuple in order.

List several values in the tuple and they fill the placeholders left to right, making it easy to combine data in one line.

Add a letter inside the braces to control output. For example {s} prints a string slice and {d} forces decimal integer formatting.

print does not add line breaks for you. Include the \n escape yourself whenever you want output to move to the next line.

One key detail: std.debug.print sends text to stderr, the error stream. That is fine for learning and quick debugging output.

Serious programs print results to stdout via a writer. But debug.print stays the friendliest choice while you are exploring.

A nice perk: std.debug.print needs no allocator. You can call it anywhere, even before you set up memory management.

You write std.debug.print("Hi\n", .{}). What is the role of the .{} part?

Use std.debug.print with a format string and an argument tuple. Fill {} placeholders, add \n yourself, and remember it writes to stderr. 🎯