Go Slices: Loop over append function

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In my previous post, I explained about append function algorithm

Now let's see how loop works with append function

Loop over append function

Let's assign the power of 2 to a slice and print it.

With normal loop we can print the slice.

We basicaly loop over the length of the slice using the index.

package main

import "fmt"



var power = []int{1,2,4,8,16,32}

func main() {
    for i:=0; i<len(power); i++ {
        fmt.Printf("2^%d = %d\n", i, power[i])
    }
}

This will output:

2^0 = 1
2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 16
2^5 = 32

Go inbuilt range function

Go provides a very simple way to loop over a slice.

package main

import "fmt"



var power = []int{1,2,4,8,16,32}

func main() {
    for i,v := range power {
        fmt.Printf("2^%d = %d\n", i, v)
    }
}

Where i is the index and v is the value of the element.

Output:

2^0 = 1
2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 16
2^5 = 32

we can also define the index as _ if we don't want to use it.

package main

import "fmt"



var power = []int{1,2,4,8,16,32}

func main() {
    for _,v := range power {
        fmt.Printf("%d\n", v)
    }
}

Output:

1
2
4
8
16
32

Conclusion

We understood how to loop over a slice using normal index based loop and range function.

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View on GitHub

https://github.com/golang/go/blob/master/src/runtime/slice.go