Javascript Aside: Object properties, First-Class Functions, and Arrays

The code

// object properties and methods
var obj = {
    greet: 'Hello'
}

console.log(obj.greet);
console.log(obj['greet']);
var prop = 'greet';
console.log(obj[prop]);

// functions and arrays
var arr = [];

arr.push(function() {
    console.log('Hello world 1');
});
arr.push(function() {
    console.log('Hello world 2');
});
arr.push(function() {
    console.log('Hello world 3');
});

arr.forEach(function(item) {
    item();
});