the-way-to-go_ZH_CN/eBook/examples/chapter_7/array_slices.go

package main

import "fmt"

func main() {
	var arr1 [6]int
	var slice1 []int = arr1[2:5] // index 5 niet meegerekend!

	// load the array with integers: 0,1,2,3,4,5
	for i := 0; i < len(arr1); i++ {
		arr1[i] = i
	}  

	// print the slice:
	for i := 0; i < len(slice1); i++ {
		fmt.Printf("Slice at %d is %d\n", i, slice1[i])
	}

	fmt.Printf("The length of arr1 is %d\n", len(arr1))
	fmt.Printf("The length of slice1 is %d\n", len(slice1))
	fmt.Printf("The capacity of slice1 is %d\n", cap(slice1))
	
	// grow the slice:
	slice1 = slice1[0:4] 
	for i := 0; i < len(slice1); i++ {
		fmt.Printf("Slice at %d is %d\n", i, slice1[i])
	}
	fmt.Printf("The length of slice1 is %d\n", len(slice1))
	fmt.Printf("The capacity of slice1 is %d\n", cap(slice1))
	
	// grow the slice beyond capacity:
	// slice1 = slice1[0:7 ] // panic: runtime error: slice bounds out of range
}