Julia: High Performance Programming

Strings

Literal strings are always ASCII (if they only contain ASCII letters) or UTF8 (if they contain characters that cannot be represented in ASCII), as in this example:

julia> typeof("hello")
ASCIIString
julia> typeof("Güdrun")
UTF8String

UTF16 and UTF32 are also supported. Strings are contained in double quotes (" ") or triple quotes (''' '''). They are immutable, which means that they cannot be altered once they have been defined:

julia> s = "Hello, Julia"
julia> s[2] = "z"
ERROR: 'setindex!' has no method matching setindex!...

A String is a succession, or an array of characters (see the Ranges and arrays section) that can be extracted from the string by indexing it, starting from 1: with str = "Julia", then str[1] returns the Char 'J'