> ## Documentation Index > Fetch the complete documentation index at: https://docs.syntblaze.com/llms.txt > Use this file to discover all available pages before exploring further. # Swift Single-line Comment 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`). ## Syntax ```swift theme={"dark"} // 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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