Function Currying

    // In JavaScript, functions are first class objects
    // just like String, Number, Boolean
    // This means they can be passed to functions or returned from functions 
    function greet (msg) {
        // console.log(msg); 
        return function(name){
        console.log(msg, name)
        // console.log('Hi', name);
        }
    }
    
    let english = greet('Hi'); 
    let svenska = greet('Hej');
    let espanol = greet('Hola'); 
    let deutsch = greet('Tag');
    
    english('Tom');
    svenska('Inga');
    espanol('Carlos'); 
    deutsch('Mattias');
    
    /*
    function x(a){
        console.log('x');
        a( ) ; // will execute function y; 
        return a;
    }
    
    function y( ){
        console.log('y') ;
    }
    
    let b = x(y); // calling function x and assigning to b
    b( ); // same as calling function y
    */