Introducing AJAX In the past, web pages required reloading the whole page every time you wanted to update the content. For example, in web-based email (like gmail.com) this meant that users had to manually reload their inbox to check and see if they had any new email. This had
The Javascript Array Filter function is used to remove unwanted elements from an array. The filter function accepts a callback function. The callback function is invoked once with each element in the array. If the callback function returns a truthy value the element stays. If the callback function returns a
Shaping Your Program “A beginning programmer writes her programs like an ant builds her hill, one piece at a time, without thought for the bigger structure. Her programs will be like loose sand. They may stand for a while, but growing too big they fall apart. Realizing this problem, the
Objects are collections of properties and values. { name: 'Tommy Boy', age: 26, weight: 306, friends: ['Richard', 'Michelle'] } var person = { fullName: 'Tommy Boy', age: 26, weight: 306, friends: ['Richard', 'Michelle'] }; // Two ways to access the data at a object's property: console.log(person.age); console.log(person['age']); Objects vs Arrays
Arrays are a data structure we can use to collect together multiple other pieces of data. Essentially, it's like a box that holds things inside in a specified order. Creating an array Arrays are created simply by surrounding the pieces of data you want in the array with square brackets