Learning GoLang

  Overview this blog will be about a  basic crud app with golang .   this app will provide API to store, update, delete information . you need to know the basics of golang to understand this project. if you do not have the basics knowledge  about golang I would suggest you to read my previous blog.  I have uploaded my code in  GitHub. click the link to clone or download this project  I am going to talk about the topic below. Project setup Data handling controller Project setup  Initiate mod and set up project as per golang. if you don't know how to setup golang project i would suggest you to have a look at my blog  Creating a project with golang . this is a really short blog. you will have a quick over view of how to setup a project with golang.  so now that you have setup the project then the folder structure will be as below. Data Handling data store, delete and update will be handled in the user module. code is given below  package moduls import ( "errors&quo

  Overview In this blog I am going to talk about the topic below. Loop break continue infinity collection Panic Switches Loop You can use loop as below. here i variable is declared inside the loop so the value will be valid in side the loop.  Example       package main import ( "fmt" ) func main() { for i:=0;i<5;i++{ fmt.Println(i) } } output : 0 1 2 3 4 5 Break in Loop what Break statement dose is it will break out from the loop.          package main      import (      "fmt"      )      func main() {      for i:=0;i<5;i++{      fmt.Println(i)      if i==2 {      break      }      }      } output : 0 1 2 in the example you can see when loop comes to the point when i == 2 then it break out from the loop and end the program. this why it out put the value of i until it is

  Overview In this blog i am going to talk about the functions and methods in golang. which is a important topic in go. if you have not read the previous blog or do not have a basic knowledge about go the i would suggest you to have a look at my other blog.  Functions   Methods Functions you can declare a function as below. you don't need to declare return type unless your not returning something from your function. you get the return value in a way that is explained in the example code . func <function name > ( <parameter> <parameter type> ) ( <return type> ){} Example Code : package main import ("fmt") func main() { test1() // example 1 sum := test2() // example 2 fmt.Println("sum =",sum) sum2,error:= test3(30,40) // example 3 fmt.Println("sum 2 =",sum2,error) sum3,_:= test3(80,60) // example 4 fmt.Println("sum 2 =",sum3) su

  Overview I have discussed data type and other basic stuff on the previous blog. Pleas check that blog by clicking on this link  . in this blog i am going to talk about the topic below Array Slice Map Structs   Array An array is a fixed size collection of similar data type .  In golang you can declare array in two way implicate and explicate. in explicate initialization you need to initialize array as bellow.      var < name> [< size> ] < type> in implicate initialization you need to initialize array as bellow.      <name> := [ <size> ] <type> {} for implicate initialization you don't have to say size of the array if your not sure of the size. compiler will automatically increase the size as you go on farther. Code : var i int package main import ( "fmt" ) func main() { var arr [3]int arrSecond := [3]int{15,45,85} arrthird := []int{15,45,85} arr[0] = 15

Overview In this blog I am going to talk about the date types and variables in go. and the topics bellow  Declaring and initializing variables   explicit initialization of variables   implicit initialization of variables complex data type list of data type Pointer pointer operator dereferencing operator address of operator Constant Iota and constant expression Declaring and initializing variables there are 2 ways you can declarer and initialize a variable they are explicit initialization variables  implicit initialization variables  Explicit initialization of variables  in this way you have to tell the compiler every thing you need to declare a variable. var i int i = 20 var j int = 3 fmt.Println(i,j) var f float32 = 32.233 fmt.Println(f)  in this way we are explicitly telling what will be the input type for that variable. Implicit initialization of variables  in this way of declaring a variable. we don't have to tell the compiler what type of data it will take on that

  index Description 1 Type: int8 8-bit signed integer 2 Type:  int16 16-bit signed integer 3 Type:  int32 32-bit signed integer 4 Type:  int64 64-bit signed integer 5 Type:  uint8 8-bit unsigned integer 6 Type:  uint16 16-bit unsigned integer 7 Type:  uint32 32-bit unsigned integer 8 Type:  uint64 64-bit unsigned integer 9 Type:  int Both in and uint contain same size, either 32 or 64 bit. 10   Type:  uint Both in and uint contain same size, either 32 or 64 bit. 11 Type:  rune It is a synonym of int32 and also represent Unicode code points. 12 Type:  byte It is a synonym of int8 . 13 Type:  uintptr It is an unsigned integer type. Its width is not defi