👔log()

👔 log()

💾 程式： replit ⬆️ 需要： HasMirrors

// ────────────────────────────────────────────────
// 2022.01.27 * (v.1)        + log()
// 2022.01.28 / log()        use Logger instead
// 2022.01.30 + log()        + param `items: [HasMirrors]`
//            / log(_ item:) delegate to `HasMirrors` method
// ────────────────────────────────────────────────

// ⭐ require `HasMirrors`

/// `log(msg)`
public func log(_ item: HasMirrors) {
    _ = item.log()
}

/// `log(items)`
/// ⭐ benefit: 
/// - needn't declare `items` as `HasMirrors`,
///   compiler will infer it.
public func log(_ items: [HasMirrors]) {
    items.log()
}

💈範例

💾 程式： replit

// log(item)
log(true)
log(1.23)

// log(items)
log([
    123, "string", 1.23, true,
])

Result:

// ✅
// 🍄 1.23
// 🍄 123
// 🍄 string
// 🍄 1.23
// ✅

📘 手冊

• Swift Ref ⟩ Expressions ⟩ Primary Expressions ⟩ Literal Expression

📗 參考

• Ficow Shen ⟩ Swift 中的 #function 到底是什么？

🗣 討論

• Weird value of #function literal in Swift 3.1

• Macros in Swift? - custom log function using #file, #line, #function ⭐️

👥 相關

• #file, #line, #function

• uses HasMirrors.

• .logType() - inspect a view's type.

History

contents

1. (2022.01.27) - first version

2. (2022.01.28) - use Logger.

1

💾 程式： replit

// ----------------------
//     ⭐ log function 
// ----------------------

func log(
    _ message: String  = "",
    file     : String  = #file,         // ⭐ file name
    line     : Int     = #line,         // ⭐ line number
    function : String  = #function,     // ⭐ function name
    note     : String? = nil            // additional info
) {
    let noteString = (note == nil) ? "" : "\n \(note!)" 
    print("\n📍 \(message)\n ( func: '\(function)', line: \(line), file: '\(file)' )\(noteString)")
}

2

// ─────────────────────────────────────
// 2022.01.27 * (v.1)
// 2022.01.28 / use Logger instead
// ─────────────────────────────────────

/// `log(msg)`
public func log(
    _ message: String  = "", 
    padding n: Int     = 0,
    dot      : String? = nil
) {
    Logger.log(message, padding: n, dot: dot)
}