Question

How to use range in for loop to iterates over a slice in Go

Answer 1

package main

import "fmt"

var sl = []int{1, 2, 3, 6, 7, 12, 16, 19, 20}

func main() {
	for i, val := range sl {
		fmt.Printf("al[%d] = %d\n", i, val)
	}
}


/*
run:

arr[0] = 1
arr[1] = 2
arr[2] = 3
arr[3] = 6
arr[4] = 7
arr[5] = 12
arr[6] = 16
arr[7] = 19
arr[8] = 20

*/

 

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Answer 2

package main

import (
    "fmt"
    "math/rand"
)

func main() {
	sl := make([]int, 5)
	fmt.Println(sl)

	for i := range sl {
		sl[i] = rand.Intn(30)
	}
	for i, val := range sl {
		fmt.Printf("sl[%d] = %d\n", i, val)
	}
}


/*
run:

[0 0 0 0 0]
sl[0] = 11
sl[1] = 27
sl[2] = 17
sl[3] = 29
sl[4] = 1

*/

 

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