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A single-line comment in Swift is a non-executable lexical construct ignored by the compiler during the lexical analysis phase. It is initiated by two consecutive forward slashes (//) and extends to the end of the current line, terminating immediately before the newline character (\n or \r\n).

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Syntax

// Single-line comment occupying an entire line
let declaration = "Swift" // Inline single-line comment following a statement

​
Technical Characteristics

  • Lexical Treatment: The Swift compiler’s lexer treats the // token and all subsequent characters up to the end-of-line (EOL) sequence as a single whitespace character.
  • Termination: The comment implicitly terminates at the end of the line; it does not require an explicit closing delimiter.
  • Character Set: The text within the comment can contain any valid Unicode character.
  • Precedence: If // appears within a string literal (e.g., "https://"), it is evaluated as part of the string data and is not parsed as a comment initiator.
  • Documentation Variant: A structural variant utilizing three consecutive forward slashes (///) functions identically in terms of execution but is parsed by the compiler to generate Markdown-based symbol documentation.
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