Go Strings

External

• String types in the language specification https://golang.org/ref/spec#String_types
• String literals in the language specification https://golang.org/ref/spec#String_literals

Internal

• Built-in Types

Overview

The pre-declared String type identifier is string. String values are (possibly empty) sequences of bytes. String values are immutable.

String Literals

A string literal is a string constant obtained from concatenating a sequence of characters.

Raw String Literals

Raw string literals are sequences of characters enclosed by backquotes (backticks) `. Any other character is taken literally, back slashes have no special meaning and new lines can appear. Carriage return characters inside raw string literals are discarded. The following code:

var sl = `Example \n \t
...
"something"`
fmt.Println(sl);

will produce:

Example \n \t
...
"something"

Interpreted String Literals

Interpreted string literals are character sequences between double quotes, as in "example".

Interpreted strings allow escaping (\n or \t).

String Equality

String equality is tested with the == operator:

var s string = "something"

if s == "something" then {
    ...
}

String Operators and Functions

Indexing Operator

Indexing operator [] returns a byte (uint8)

Strings are indexed starting with 0. If the index is out of bounds, the runtime generates a run-time panic:

panic: runtime error: index out of range

Concatenation Operator

Concatenation operator + concatenates two strings together. Since Go is strong typed, using the concatenation operation between a string and an int, for example, won't work, the int won't be automatically converted to string, Java style.

"a" + "b"

String Length

len()

Conversion of a byte to string

Conversion between bytes and strings

Reading with a string with a Reader

TODO

strings.NewReader()

See Go_Package_strings#NewReader.28.29