One-liners#
Single-expression idioms the operator pastes into a Go scratch file.
Print to stderr without importing log.
fmt.Fprintln(os.Stderr, "msg")
Read a whole file in one expression.
b, err := os.ReadFile("notes.txt")
Write a whole file in one expression.
err := os.WriteFile("out.bin", payload, 0644)
Build a string with strings.Join; avoid + in a loop.
joined := strings.Join(parts, ",")
Parse an integer or fail.
n, err := strconv.Atoi(s)
Range a slice and capture the index and value.
for i, v := range xs { use(i, v) }
Inline conditional via a function (Go has no ternary).
func ifelse[T any](c bool, a, b T) T { if c { return a }; return b }
Defer a cleanup so it runs on every exit path.
f, err := os.Open(p); if err != nil { return err }
defer f.Close()
Open a TCP connection with a timeout.
conn, err := net.DialTimeout("tcp", "example.com:443", 3*time.Second)