Notes on Tech Tweedie

Go বেসিক

Mon, 01 Jan 0001 00:00:00 +0000

Introduction

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Hello World

A sample go program is show here.

package main

import "fmt"

func main() {
 message := greetMe("world")
 fmt.Println(message)
}

func greetMe(name string) string {
 return "Hello, " + name + "!"
}

Run the program as below:

$ go run hello.go

Variables

Normal Declaration:

var msg string
msg = "Hello"

Shortcut:

msg := "Hello"

Constants

const Phi = 1.618

Basic Types

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Strings

str := "Hello"

Multiline string

str := `Multiline
string`

Numbers

Typical types

num := 3 // int
num := 3. // float64
num := 3 + 4i // complex128
num := byte('a') // byte (alias for uint8)

Other Types

var u uint = 7 // uint (unsigned)
var p float32 = 22.7 // 32-bit float

Arrays

// var numbers [5]int
numbers := [...]int{0, 0, 0, 0, 0}

Pointers

func main () {
 b := *getPointer()
 fmt.Println("Value is", b)

func getPointer () (myPointer *int) {
 a := 234
 return &a

a := new(int)
*a = 234

Pointers point to a memory location of a variable. Go is fully garbage-collected.

অ্যাডভান্সড

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Flow Control

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Condition

if day == "sunday" || day == "saturday" {
 rest()
} else if day == "monday" && isTired() {
 groan()
} else {
 work()
}

if _, err := doThing(); err != nil {
 fmt.Println("Uh oh")

Switch

switch day {
 case "sunday":
 // cases don't "fall through" by default!
 fallthrough

 case "saturday":
 rest()

 default:
 work()
}

Loop

for count := 0; count <= 10; count++ {
 fmt.Println("My counter is at", count)
}

entry := []string{"Jack","John","Jones"}
for i, val := range entry {
 fmt.Printf("At position %d, the character %s is present\n", i, val)

n := 0
x := 42
for n != x {
 n := guess()
}

File Manipulation

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Condition

if day == "sunday" || day == "saturday" {
 rest()
} else if day == "monday" && isTired() {
 groan()
} else {
 work()
}

if _, err := doThing(); err != nil {
 fmt.Println("Uh oh")

Bash Variables

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Variable

NAME="John"
echo $NAME
echo "$NAME"
echo "${NAME}

Condition

if [[ -z "$string" ]]; then
 echo "String is empty"
elif [[ -n "$string" ]]; then
 echo "String is not empty"
fi

Notes on Tech Tweedie

Go বেসিক

Introduction

Hello World

Variables

Constants

Basic Types

Strings

Numbers

Arrays

Pointers

অ্যাডভান্সড

Flow Control

Condition

Switch

Loop

File Manipulation

Condition

Bash Variables

Variable

Condition

Go এর নোট সমূহ

Go Notes

নোট সমূহ

ব্যাশের নোট সমূহ

Bash Notes