Go Cheat Sheet

Go syntax, goroutines, channels, error handling, and package structure for writing concurrent, statically typed programs.

2 PagesIntermediateApr 5, 2026

Basic Syntax

Variables, control flow, and printing.

package mainimport "fmt"func main() {    age := 30              // short variable declaration    name := "Ada"    var pi float64 = 3.14159    if age >= 18 {        fmt.Println(name, "is an adult")    }    for i := 0; i < 5; i++ {        fmt.Println("Count:", i)    }}

Goroutines & Channels

Concurrency primitives built into the language.

func worker(id int, jobs <-chan int, results chan<- int) {    for j := range jobs {        results <- j * 2    }}func main() {    jobs := make(chan int, 5)    results := make(chan int, 5)    go worker(1, jobs, results)  // launch goroutine    for i := 1; i <= 5; i++ {        jobs <- i    }    close(jobs)    for i := 0; i < 5; i++ {        fmt.Println(<-results)    }}

Error Handling

Idiomatic multi-value error returns.

func divide(a, b float64) (float64, error) {    if b == 0 {        return 0, fmt.Errorf("cannot divide %f by zero", a)    }    return a / b, nil}func main() {    result, err := divide(10, 0)    if err != nil {        fmt.Println("Error:", err)        return    }    fmt.Println("Result:", result)}