String

Method	Returns	Notes
`.length()`	`Int`
`.isEmpty()`	`Bool`
`.toUpperCase()`	`String`
`.toLowerCase()`	`String`
`.capitalise()`	`String`	First char upper, rest lower
`.trim()`	`String`
`.trimStart()`	`String`
`.trimEnd()`	`String`
`.contains(s: String)`	`Bool`
`.startsWith(s: String)`	`Bool`
`.endsWith(s: String)`	`Bool`
`.indexOf(s: String)`	`Option<Int>`	`None` if not found
`.substring(start, end: Int)`	`Option<String>`	`None` if out of bounds
`.replace(from, to: String)`	`String`	Replaces all occurrences
`.split(sep: String)`	`List<String>`
`.splitOnce(sep: String)`	`Option<#(String, String)>`	`None` if separator not found
`.reverse()`	`String`
`.first()`	`Option<String>`	First character, `None` if empty
`.last()`	`Option<String>`	Last character, `None` if empty
`.toOption()`	`Option<String>`	`None` if empty string, `Some(s)` otherwise