Question about For Loops in GO

Question

Hello!

So, just a small intro
New to GO, well programming..

Within a for loop. I see the ' _ ' used.
What does it do?
I see references in python as a variable, but if I change ' _ ' to q var1 it fails.
So what is this
for _,
Thank you in advanced!
small snippet:

package main

import "fmt"

func main() {

nums := []int{2, 3, 4}
sum := 0
for _, num := range nums {
sum += num
}
fmt.Println(sum)
}

Output: 9

Answer 1

Steven Oro

an array contains index and value and value access by index.

Underscore (_) is used to skip index and get value without index.

You can change _ to any variable but you have to use it otherwise error will come

package main

import "fmt"

func main() {

nums := []int{2, 3, 4}
sum := 0
for var1, num := range nums {
fmt.Println ("Index", var1)
sum += num
}
fmt.Println(sum)
}

-----------access value using index---------

package main

import "fmt"

func main() {

nums := []int{2, 3, 4}
sum := 0
for var1 := range nums {
sum += nums[var1]
}
fmt.Println(sum)
}

-------------