A case for Zig in new systems code
A systems programmer has set out a practical case for choosing Zig over C for new low-level projects, focusing on error cleanup, testability and safer handling of arrays rather than claiming that Zig replaces C's ecosystem. The comparison was published using examples compiled with Zig 0.17 and Clang on macOS.
Both languages target programmers who want small, native binaries, direct control over memory and no garbage collector. That shared philosophy makes the comparison different from debates involving languages with larger runtimes or more restrictive ownership systems. Zig can also call C libraries through the C application binary interface, allowing mixed projects rather than requiring wholesale migration.
The author identifies resource cleanup as one area where Zig can make failure paths easier to follow. C code that acquires several resources often uses labels and `goto` statements to release them in reverse order after an intermediate failure. Zig's `errdefer` places cleanup beside the allocation it reverses and executes those operations automatically when a function returns an error. Its testing library can also inject allocation failures and detect leaked memory, making multiple failure paths easier to exercise.
Array handling provides another contrast. In C, an array passed to a function typically becomes a pointer, with its length supplied separately. A mismatch can produce an out-of-bounds read without a compiler warning. Zig slices carry their length, and debug builds can stop on an invalid index. That protection is not absolute: optimized modes may disable checks, and Zig still permits errors such as using freed memory or retaining an invalid stack pointer.
Modern tools, younger ecosystem
The comparison also credits Zig's integrated build tooling and its ability to compile C sources, offering a gradual route for existing projects. C files can remain next to Zig code while teams move components individually. Zig 0.17 uses `zig translate-c` for header translation after removing the earlier `@cImport()` mechanism.
The tradeoffs remain substantial. C has decades of compatibility, a far larger body of documentation and developers, mature tools, and compilers for processors that Zig does not support. The author notes that 35 of 152 Zig files for a book needed changes when version 0.17 arrived, while old C code commonly continues to compile. Vendor-only microcontrollers may leave C as the only realistic choice.
The result is a preference rather than a universal prescription. Zig offers conveniences that can expose mistakes earlier and reduce manual cleanup work, but its evolving language and smaller platform footprint make project requirements decisive. C remains foundational to Unix, kernels and system libraries even for developers who select Zig for greenfield code.
