Overview
In this blog I am going to talk about the topic below.
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 2.
Continue in Loop
what Continue statement dose is it will break out from the loop but will continue with the next iteration that loop. but it will ignore every code after that statement.
package main
import ("fmt")
func main() {
for i:=0;i<5;i++{
fmt.Println(i)
if i==2 {
continue
}
fmt.Println("hello")
}
}
output :
0
hello
1
hello
2
3
hello
4
hello
if you can see, in the example program is not printing the hello string when i == 2. but continues with the loops next iteration.
Infinity Loop
you can initiate infinite loop as below.
package main
import (
"fmt"
)
func main() {
i := 1
for {
fmt.Println(i)
}
}Collection Loop
you can iterate any collection using normal loop. but go has a very minimalistic way of looping a collection where you can iterate collection in a simple way which is range.
package main
import ("fmt")
func main() {
array := []string{"hello","world","!!!"}
marks := map[string]int{"Bangla":80,"English":90,"Science":95}
for i,v := range array {
fmt.Println(i,v)
}
for i,v := range marks {
fmt.Println(i,v)
}
}
output :
0 hello
1 world
2 !!!
Bangla 80
English 90
Science 95
Switch
Switch on golang is parity much self explanatory. you can understand switch by the example below.
package main
package main
import (
"fmt"
)
func main() {
nameAgeList := map[string]int{"Alax":18,"Jack":10,"Dani":21}
for name,age := range nameAgeList {
switch name {
case "Alax" :
fmt.Println("go to collage your age is",age)
case "Jack" :
fmt.Println("go to school your age is",age)
case "Dani" :
fmt.Println("go to University your age is",age)
}
}
}
output :
go to collage your age is 18
go to school your age is 10
go to University your age is 21
Panic
Panic is used in golang where program hits a position that it doesn't knows what to do. i know you can use error and exceptions in go for that but in panic it will terminate the program and report where it hits the problem.
package main
import (
"fmt"
)
func main() {
nameAgeList := map[string]int{"Alax":18,"Jack":19,"Dani":21}
for name,age := range nameAgeList {
switch name {
case "Alax" :
fmt.Println("go to collage your age is",age)
case "Jack" :
if age > 18 {
panic("somthing is worng")
}
fmt.Println("go to school your age is",age)
case "Dani" :
fmt.Println("go to University your age is",age)
}
}
}
output :
go to collage your age is 18
panic: somthing is worng
goroutine 1 [running]:
main.main()
/tmp/sandbox467193843/prog.go:17 +0x3d1
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