HOC, decorating functions

decorator.js

function doSomething(name) {
    console.log('hello ' + name);
}

function loggingDecorator(wrappedFunction) {
    return function() {
        console.log('starting');
        const result = wrappedFunction.apply(this, arguments);
        console.log('finished');
        return result;
    }
}

const wrapped = loggingDecorator(doSomething);

doSomething('paul'); // 'hello paul'
wrapped('paul'); // 'starting', 'hello paul', 'finished'