richardfat7 / go-lang-cheat-sheet

A simple little cheat-sheet for using go-lang

Comments

// Line Comment /* Block Comment */

Data Types

bool (true / false)

uint8 (255 max) uint16 (65,535 max) uint32 (4.2 billion max) uint64 (18,446 trillion max) uint alias for uint32 uintptr byte aslias for uint8

int8 (127 max) int16 (32767 max) int32 (2.1 billion max) int64 (9,223 trillion max) int alias for int32 rune alias for int32

float32 ex: 0.123456 float64 ex: 0.1e-5

complex64 ex: 12.34i complex128 ex: 12.1e-5i

string

NaN Array Slice Struct Map func

#functions

func add(x int, y int) int { return x + y }

#unknown

<<

unbounded slices??

const ( Big = 1<<100 Small = Big>>99 )

Loops

// for i := 0; i < 10; i++ { fmt.Println($i) }

// Equiv i := 0; for i < 10 { fmt.Println($i) i++ }

// For Each Loops pow = []int{1, 2, 4, 8, 16, 32, 64, 128, 256} for i, v := range pow { fmt.Printf("%d: %d\n", i, v) }

// Switches switch i { case 0: // do something default: f(): // do something else }

Operators and assignment

= := += -= ++

• Concat or addition, depending on context & Assign by reference (pointer)

Checkings

<

Common

fmt.Printf (debug) fmt.Prinln (print a line with values)

#maps m[key] = elem insert of update elem = m[key] retreive an element delete(m, key) delete an element elem, ok = m[key] test that a key is present

m := map[string]int { "item1" : 123, "item2" : 456, }

#slices p := []int{2, 3, 5, 7, 11, 13} sliced := p[2:4]