Funktionen und Prozeduren

// Funktionsdeklaration
function calculateArea(width, height) {
    return width * height;
}

// Funktionsausdruck
const multiply = function(a, b) {
    return a * b;
};

// Arrow-Funktionen (ES2015)
const add = (a, b) => a + b;
const square = x => x * x;

// Higher-Order-Funktionen
function createMultiplier(factor) {
    return function(number) {
        return number * factor;
    };
}

const double = createMultiplier(2);
console.log(double(5)); // Ausgabe: 10

// Callback-Funktionen
function processData(data, callback) {
    let processed = data.map(item => item * 2);
    callback(processed);
}

processData([1, 2, 3], result => console.log(result));