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How to copy one slice items into another slice in Golang?

The built-in copy function is used to copy data from one slice to another.

Example

package main

import "fmt"

func main() {
	a := []int{5, 6, 7} // Create a smaller slice
	fmt.Printf("[Slice:A] Length is %d Capacity is %d\n", len(a), cap(a))

	b := make([]int, 5, 10) // Create a bigger slice
	copy(b, a)              // Copy function
	fmt.Printf("[Slice:B] Length is %d Capacity is %d\n", len(b), cap(b))

	fmt.Println("Slice B after copying:", b)
	b[3] = 8
	b[4] = 9
	fmt.Println("Slice B after adding elements:", b)
}

Output

[Slice:A] Length is 3 Capacity is 3
[Slice:B] Length is 5 Capacity is 10
Slice B after copying: [5 6 7 0 0]
Slice B after adding elements: [5 6 7 8 9]
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