Tour of Go 2.0

For is Go's "while"

Once you drop the init and post, you can drop the semicolons too. What you’re left with is Go’s version of while — except it’s still called for.

C’s while is spelled for in Go. Same idea, cleaner syntax, one less keyword to remember.

main.go ▶ Run in Playground 
package main

import "fmt"

func main() {
	sum := 1
	for sum < 1000 {
		sum += sum
	}
	fmt.Println(sum)
}