Methods are called with dot notation followed by parentheses: value.method(args).
length is a property (no parentheses); all others are methods (require ()).
| Method / Property | Returns | Description |
|---|---|---|
s.length |
Integer |
Number of characters (Unicode-aware) |
s.upper() |
String |
Uppercase copy |
s.lower() |
String |
Lowercase copy |
s.trim() |
String |
Removes leading and trailing whitespace |
s.contains(sub) |
Bool |
Whether the string contains the substring |
s.split(sep) |
List |
Splits on separator; defaults to a single space |
s.starts_with(prefix) |
Bool |
Whether the string starts with the given prefix |
s.ends_with(suffix) |
Bool |
Whether the string ends with the given suffix |
s.replace(old, new) |
String |
Replaces all occurrences of old with new |
s.index_of(sub) |
Integer |
UTF-8 byte offset of first occurrence, or -1 if not found |
let name = " Joa Language "
print(name.trim()) // "Joa Language"
print(name.trim().upper()) // "JOA LANGUAGE"
print(name.trim().lower()) // "joa language"
print(name.trim().contains("Lang")) // true
print(name.trim().split(" ")) // [Joa, Language]
print(name.trim().starts_with("Joa")) // true
print(name.trim().ends_with("e")) // true
print(name.trim().replace("Joa", "Go")) // "Go Language"
print(name.trim().index_of("L")) // 4
print(name.length) // 16 (includes spaces)Method calls can be chained:
let clean = raw_input.trim().lower().replace("-", "_")len(s), s.length, and string indexing count Unicode code points, not grapheme clusters. index_of() uses a byte offset instead, so its result may differ from a character index for non-ASCII text. For example, "éa".index_of("a") returns 2, while "éa"[1] returns "a".