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Home » Golang » Golang Reference Golang copy() Function with ExamplesGolang | copy() Function: Here, we are going to learn about the built-in copy() function with its usages, syntax, and examples. Submitted by IncludeHelp, on October 14, 2021 [Last updated : March 15, 2023] copy() FunctionIn the Go programming language, the copy() is a built-in function that is used to copy the elements from a source slice into a destination slice and returns the number of copied elements copied. It accepts two parameters (dst, src []Type) and returns the number of copied elements. Syntax func copy(dst, src []Type) int Parameter(s) dst : The destination slice in which we have to copy the elements. src : The source slice whose elements are to be copied. Return ValueThe return type of the copy() function is an int, it returns the total number of copied elements. Example 1 // Golang program to demonstrate the // example of copy() function package main import ( "fmt" ) func main() { // Creating int and string slices s1 := []int{10, 20, 30} s2 := []string{"Hello", "World"} s3 := make([]int, len(s1)) s4 := make([]string, len(s2)) // Printing types and values of slices fmt.Printf("s1: %T, %v\n", s1, s1) fmt.Printf("s2: %T, %q\n", s2, s2) // Copying slices m := copy(s3, s1) fmt.Println(m, "elements copied.") n := copy(s4, s2) fmt.Println(n, "elements copied.") // After copying, // Printing types and values of slices fmt.Println("After copying...") fmt.Printf("s3: %T, %v\n", s3, s3) fmt.Printf("s4: %T, %q\n", s4, s4) } Output s1: []int, [10 20 30] s2: []string, ["Hello" "World"] 3 elements copied. 2 elements copied. After copying... s3: []int, [10 20 30] s4: []string, ["Hello" "World"] Example 2 // Golang program to demonstrate the // example of copy() function package main import ( "fmt" ) func main() { // Creating a byte slice s := "Hello" b := make([]byte, len(s)) // Printing types and values fmt.Printf("s: %T, %q\n", s, s) fmt.Printf("b: %T, %q\n", b, b) // Copying bytes from a string // to a slice of bytes n := copy(b, s) fmt.Println(n, "elements copied.") // After appending, // Printing type and value of slice fmt.Println("After copying...") fmt.Printf("s: %T, %q\n", s, s) fmt.Printf("b: %T, %q\n", b, b) } Output s: string, "Hello" b: []uint8, "\x00\x00\x00\x00\x00" 5 elements copied. After copying... s: string, "Hello" b: []uint8, "Hello"Golang builtin Package » Golang complex() Function Golang delete() FunctionRelated Tutorials Golang true, false Constants Golang iota Constant Golang nil Variable Golang append() Function Golang cap() Function Golang close() Function Golang complex() Function Golang delete() Function Golang imag() Function Golang len() Function Golang make() Function Golang new() Function Golang panic() Function Golang print() Function Golang println() Function Golang real() Function Golang recover() FunctionComments and Discussions! |
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