You wake up and look at the clock and woo it's late to go to work. its always happen to you and make it as daily activity.
it will repeat the same thing but you can change that until something happen, stop and never happen again.
Is a simple concept of looping doing something until you decide to stop you want to stop until a condition is happen.
Write simple code loop
Golang has only have a loop it is for
loop lets we code
package main
import "fmt"
func main() {
for i := 0; i < 10; i++ {
fmt.Printf("Loop in number %d\n", i)
}
}
We can write loop from 0 (i := 0)
, and make a condition i<10
, if the condition is not true
looping will be stop. Increase the variable i i++
so the the loop will stop.
Loop iteration data type
Now the condition is what happen if we want to get value of slice? we can create like below.
package main
import "fmt"
func main() {
fruits := []string{"banana","watermelon","apple","coconut"}
for i := 0; i < len(fruits); i++ {
fmt.Printf("Fruit index %d is %s\n", i, fruits[i])
}
}
We create loop i
until i
have value less than 4. and we get fruit at index of i
, but it is not a best practice, we know that we can use range
instead.
package main
import "fmt"
func main() {
fruits := []string{"banana","watermelon","apple","coconut"}
for i, item := range fruits {
fmt.Printf("Fruit index %d is %s\n", i, item)
}
}
Nested loop
Imagine we want to create coordinate that have latitude and longitude. We can create is nested as below.
package main
import "fmt"
func main() {
for i := 0; i < 10; i++ {
for j := 0; j < 20; j++ {
fmt.Printf("%d%d ",i,j)
}
fmt.Println()
}
}
Infinity loop
How if we don't know when we should stop the loop. we can use infinity loop, but the question is how to stop infinity loop? actually loop it will stop manually using key break
like below.
package main
import "fmt"
func main() {
for true {
fmt.Printf("Infinity loop")
break
}
}
Conclusion
Now we know about loop so you can write "I will not do that again" 100 times without write it until 100 manually.
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