Binary strings: Difference between revisions

=={{header|Wren}}==

In Wren, a string is simply an array of bytes. Although they are typically characters stored in UTF-8 format, they don't have to be interpreted in that way and, in recognition of this as well as for efficiency reasons, many of the built-in string functions operate at the byte level.

Despite this, there is no separate byte type - one just uses a single character string instead.

Strings are immutable and assignment creates a new copy rather than a reference to the original string.

All strings belong to the built-in String class which does not have an explicit constructor. To create one you either use a literal (a series of characters enclosed in double quotes) or assign an existing string.

When there are no longer any references to a string it is automatically garbage collected. You can't really destroy a string manually though you can request an immediate garbage collection be performed by calling the ''System.gc()'' method.

Setting a string variable to the special value ''null'' means that the variable currently has no value though it can still be assigned one later.

<lang ecmascript>// create string

var s = "abc"

// destroy string (not really see notes above)

s = null

// (re)assignment

s = "def"

// comparison (only == && != supported directly)

var b = (s == "abc") // false

// cloning/copying

var t = s

// check if empty

s = ""

b = (s != "") // false

b = s.isEmpty // true

// append a byte

s = s + "b"

// extract a substring

s = "ghijkl"

t = s[1..4] // "hijk"

// replace a byte or string

s = "abracadabra"

s = s.replace("a", "z") // "zbrzczdzbrz"

// join strings

s = "abc"

t = "def"

var u = s + t // "abcdef"</lang>