Go - String

Declaration

The following declarations are all equivalent:

// The short variable declaration (only within a function, not for package-level variables)
s := "" 
// Initialized to the default ""
var s string 
var s = "" 
var s string = "" 

Concatenation

For:

• a few. The += statement. It makes a new string by concatenating the old string, a space character, and the next argument, then assigns the new string to s. The old contents of s are no longer in use, so they will be garbage-collected in due course. If the amount of data involved is large, this could be costly
• a big string construction. Use the Join function from the strings package.

Scanner

Scanner that reads input and breaks it into lines or words;

Example: get a count of text on a line. All duplicate have more than one counts.

func countLines(f *os.File, counts map[string]int) {
	input := bufio.NewScanner(f)
	for input.Scan() {
		counts[input.Text()]++
	}
}