GoBasics

Basics of Go Programming Language

GO Cheatsheet

Variables

declare variable

var name string = "John"

map

var m map[string]string

a := make(map[string]string) a := map[string]string{"key1":"value1", "key2":"value2"}

array

var a [5]int // array of 5 integers a := [5]int{1,2,3,4,5} // array of 5 integers initialized with values

slice

var s []int // slice of integers a := make([]int, 5) // slice of integers initialized with 5 zeros a := []int{1,2,3,4,5} // slice of integers initialized with values

multiple variable declaration

var a, b, c int = 1, 2, 3

var ( a string = "initial" b int )

struct

type person struct { name string age int }

a := person{name: "John", age: 30} a := person{"John", 30}

a.name = "John" a.age = 30

Types

bool string int int8 int16 int32 int64 uint uint8 uint16 uint32 uint64 uintptr byte // alias for uint8 rune // alias for int32 // represents a Unicode code point float32 float64 complex64 complex128

Conditions

comparison operators

== equal to != not equal to < less than <= less than or equal to

greater than = greater than or equal to

Logical operators

&& and || or ! not

If else & switch

if x > 10 { // do something } else if x < 5 { // do something else } else { // do yet another thing }

switch x { case 1: // do something case 2: // do something else default: // do yet another thing //optional }

Arithmetic operators

• addition

• subtraction

• multiplication / division % modulus ++ increment by 1 -- decrement by 1

Slices

a := make([]int, 5) // slice of integers initialized with 5 zeros a := []int{} a := []int{1,2,3,4,5}