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Str Module (Strings)

String manipulation utilities. All functions are available as static methods on the Str object.

Note: We use the Str object instead of String to avoid conflicts with the built-in String type.

Functions

Function Type Signature Description
Str.len (s: String) -> Integer Returns the length of the string in Unicode characters.
Str.compare (a: String, b: String) -> Integer Compares two strings. Returns 0 if equal.
Str.concat (a: String, b: String) -> String Concatenates two strings into a new one.
Str.upper (s: String) -> String Converts string to uppercase.
Str.lower (s: String) -> String Converts string to lowercase.
Str.trim (s: String) -> String Removes leading/trailing whitespace.
Str.contains (s: String, sub: String) -> Boolean Checks if string contains a substring.
Str.startsWith (s: String, pre: String) -> Boolean Checks if string starts with prefix.
Str.endsWith (s: String, suf: String) -> Boolean Checks if string ends with suffix.

Conversions

Function Type Signature Description
to_string `(x: Integer Float

String interpolation uses the same display formatting as to_string(...) for supported scalar values, so "{true}", "{'🚀'}", and "{None}" render as true, 🚀, and None. Complex interpolation values such as "{Option.some(1)}" are currently rejected until structured formatting exists.

Str.* calls and to_string(...) can be used directly as expression tails, including inside async { ... }, if expressions, and match arms.

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