Pranava S Balugari
Posted on June 19, 2020
Go has only one looping construct, the for loop. It comes with 2 variations from a usability point of view. Understanding the differences will definitely help in implementing the right one at the right time :).
Table Of Contents
Pointer semantic form
In this one the loop happens on the original continents array.
// Using the Pointer semantic form of for: <- range
package main
import "fmt"
func main() {
continents := [3]string{'Asia', 'Africa','Australia'}
fmt.Printf("Before -> [%s] : ", continents[1])
for i := range continents {
continents[1] = 'Europe'
if i == 1 {
fmt.Printf("After -> [%s] : ", continents[1])
}
}
}
Output:
Before -> [Africa] : After -> [Europe]
Value semantic form
In this one the looping happens on the copy of the original array.
// Using the value semantic form of for: <- range
package main
import "fmt"
func main() {
continents := [3]string{'Asia', 'Africa','Australia'}
fmt.Printf("Before -> [%s] : ", continents[1])
for i, c := range continents {
continents[1] = 'Europe'
if i == 1 {
fmt.Printf("After -> [%s] : ", c)
}
}
}
Output:
Before -> [Africa] : After -> [Africa]
There is one more value semantic form of the for range but with pointer semantic access. DON'T DO THIS.
package main
import "fmt"
func main() {
continents := [3]string{'Asia', 'Africa','Australia'}
fmt.Printf("Before -> [%s] : ", continents[1])
for i, c := range &continents {
continents[1] = 'Europe'
if i == 1 {
fmt.Printf("After -> [%s] : ", c)
}
}
}
Output:
Before -> [Africa] : After -> [Europe]
💖 💪 🙅 🚩
Pranava S Balugari
Posted on June 19, 2020
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