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Go Cheat Sheet

Description

Go is a popular open-source programming language developed by Google. It's designed for building modern, efficient, and scalable applications. Go combines the best features of different programming languages, making it a fast, statically-typed, and garbage-collected language that provides memory safety.

Versions

Version Latest Patch Release Release Date End of Support
1.21 1.21.5 August 16, 2022 TBD
1.20 1.20.4 February 16, 2022 February 2023
1.19 1.19.14 August 2, 2021 August 2022
1.18 1.18.4 February 16, 2021 February 2022
1.17 1.17.7 August 16, 2020 August 2021
1.16 1.16.13 February 16, 2020 February 2022
1.15 1.15.15 August 11, 2019 August 2020
1.14 1.14.15 February 25, 2019 February 2020
1.13 1.13.15 September 3, 2018 September 2019
1.12 1.12.18 February 16, 2018 February 2020
1.11 1.11.15 August 24, 2017 August 2018
1.10 1.10.8 February 17, 2017 February 2018
1.9 1.9.7 August 24, 2016 March 2018
1.8 1.8.9 February 17, 2016 March 2018
1.7 1.7.6 March 3, 2015 December 2016
1.6 1.6.4 February 19, 2015 February 2017
  • Please note that this table includes the latest patch release, release date, and end of support for each version of Go. The end of support date indicates when the Go team will stop providing security patches and updates for that version of Go. It's important to keep your Go version up-to-date to ensure that your projects are secure and stable.

Data Types

Go has several built-in data types, including:

Data Type Description
string Represents a sequence of characters.
int, int8, int16, int32, int64 Represents signed integers of various sizes.
uint, uint8, uint16, uint32, uint64 Represents unsigned integers of various sizes.
float32, float64 Represents floating-point numbers.
bool Represents a boolean value (true or false).
array Represents a fixed-sized array of elements.
slice Represents a dynamic array that can grow or shrink during runtime.
map Represents an unordered collection of key-value pairs.

Variables and Constants

Variables and constants in Go are declared using the var and const keywords, respectively:

var variableName string = "value"
const constantName string = "value"

Go also supports shorthand variable declaration and initialization using the := operator:

variableName := "value"

Control Flow

Go supports several control flow statements, including:

  • if statements for conditional execution.
  • for statements for looping.
  • switch statements for multi-way branching.
  • defer statements for deferring the execution of a function until the surrounding function returns.

Functions

Functions in Go are declared using the func keyword:

func functionName(parameterName parameterType) returnType {
  // function body
  return value
}

Arrays and Slices

Arrays in Go have a fixed size and are declared as follows:

var arrayName [size]type = [size]type{value1, value2, ...}

Slices are dynamic arrays and are declared using the make function:

sliceName := make([]type, length, capacity)

Maps

Maps in Go associate keys with values and are declared using the make function:

mapName := make(map[keyType]valueType)

Packages and Imports

Go programs are organized into packages, which can be imported by other packages to reuse their functionality. The import keyword is used to import packages:

import "packageName"

Additional Resources

Example

Here is a simple example of a Go program that calculates the factorial of a number:

package main

import "fmt"

func factorial(n int) int {
  if n == 0 {
    return 1
  }
  return n * factorial(n - 1)
}

func main() {
  var n int
  fmt.Print("Enter a number: ")
  fmt.Scan(&n)
  fmt.Println("The factorial of", n, "is", factorial(n))
}

Conclusion

This cheat sheet provided an overview of the basic concepts and elements of the Go programming language. To learn more, it is recommended to visit the Go documentation. With its simplicity, performance, and scalability, Go is a great choice for building modern and efficient applications.