Joining Strings
Glue two pieces of text together with +.
1package main
2
3import "fmt"
4
5func main() {
6 first := "Coding"
7 second := "is fun"
8 fmt.Println(first + " " + second)
9}
$ go run main.go
Coding is fun
Every line, explained
package main- Every Go file starts by saying which package it belongs to. package main means "this is a program you can run", and Go will look inside it for func main.
import "fmt"- import brings in a package from Go's standard library. "fmt" (short for format) is the one full of printing tools, like fmt.Println.
func main() {- func main() { ... } is where a Go program starts. When you run the program, Go finds func main inside package main and runs everything between its braces, top to bottom.
first := "Coding"- := is Go's declare-and-assign: it creates a new variable AND stores a value in one step, and Go works out the type by itself. You will use := constantly in Go. (No semicolon needed; Go adds them for you behind the scenes.)
second := "is fun"- := is Go's declare-and-assign: it creates a new variable AND stores a value in one step, and Go works out the type by itself. You will use := constantly in Go. (No semicolon needed; Go adds them for you behind the scenes.)
fmt.Println(first + " " + second)- Using + between strings glues them together (concatenation). + adds no space by itself, so we glue a " " (a space) in the middle.
}- This closing brace } ends func main.