💾functionDefinition()

JS ⟩ values ⟩ custom functions ⟩ functionDefinition()

💾 程式

• replit：isClass()

• (to use it, copy and paste from 📁 module file： typeName())

// ⭐️ content of function definition (string)
function functionDefinition(value) {
    
    // ---------------------------------------------------------------------
    // ⭐️ will throw a TypeError if value is not a function:
    //   ⛔ TypeError: 
    //      Function.prototype.toString requires that 'this' be a Function
    // ---------------------------------------------------------------------
    
    return Function.prototype.toString.call(value);
}

💈範例：👉 isClass()

⬇️ 應用

• isClass() - check if value is a class.