v — consolidated language guide — DedSec Project

V

How the language behaves

V is a compiled systems-oriented language emphasizing simple syntax and explicit handling of many failure cases.

Source fragment to analyze

fn main() {
    nums := [1, 2, 3]
    println(nums.len)
}

Deliberate exercise

Trace array length, then use an optional-returning function and handle its failure without pretending a value always exists.

Check a failure condition

Language/compiler revisions may adjust syntax; pin a tested V toolchain for reproducible examples.

Record input, expected output and observed output with the actual V implementation and version. If no compatible runtime exists on your current platform, label the fragment unexecuted and reason from its semantics rather than claiming a successful run. Run a second isolated experiment that changes only the mechanism under investigation; preserve the exact diagnostic while removing private data.

V — Expanded practice workbook

Read the baseline source

fn greet(name string) string { return 'Hello, ${name}!' }
fn main() { println(greet('Ada')) }

Relevant environment: v run hello.v.. Verify that the matching compiler, host or simulator is available before treating output as authoritative. For scripts that can interact with personal files or systems, use a scratch workspace and read-only fixtures by default.

Detailed working objective

Define a struct with a mutable field and a parsing function that returns an error option/result. Test rejected input and compare immutability of normal bindings.

The failure that must be understood

V language syntax has changed across releases; test with v version, especially option propagation and mut syntax.