Posts Tagged: javascript

Strict Mode in JavaScript

JavaScript strict mode tells the interpreter to be more particular about what is allowed. In general terms, strict mode makes your code a little safer by turning some bad coding practices into exceptions. For existing code, this is good and bad. It’s good, because it helps you find some potential bugs, like accidental globals. It’s… Read more »

Property Descriptors in JavaScript

Some of the most common complaints about JavaScript come from its dynamic, mutable nature. You can modify nearly any member of any object and even delete some built-in ones! This enables web developers to improve cross-browser compatibility of their sites while maintaining code readability with a technique called poly-filling. On the other hand, it also… Read more »

Private Variables in JavaScript

Because JavaScript uses prototype-based inheritance, there is no keyword to define a member as “private” or “protected”. Either the object has a member, or it doesn’t, and you can access that member from anywhere you can access the object. Do not despair! There is a way to implement private variables… using another feature of the… Read more »

Inheritance in JavaScript

Native JavaScript inheritance is prototypical. For one, this means that you don’t inherit from classes, you inherit from objects. You don’t define classes and instantiate them. Instead, you create objects and use them as a “prototype” or “base” for your own object instances. In JavaScript, this is facilitated with the mechanisms called “prototype” and “constructor”.

Useful JavaScript Features You Aren’t Using

JavaScript is one of the most widely used and misunderstood programming languages in existence. Nearly every personal computer and mobile device in the world can interpret it, and nearly every developer (and non-developer) that has made a website has written it, some without knowing it! If you call yourself a JavaScript developer, then here are… Read more »

Input Kludge Anti-Pattern

As an anti-pattern, input kludge describes a poor user interface that either rejects or incorrectly handles valid input. How to Identify The most obvious code smell that may point to this pattern is ad-hoc input validation routines. Look for: JavaScript validation function defined directly in web page or view code. Server-side validation routine defined in… Read more »