Links. JSON. The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON. It can't be called or constructed, and aside from its two method properties it has no interesting functionality of its own. DescriptionEdit JavaScript Object Notation JSON is a syntax for serializing objects, arrays, numbers, strings, booleans, and null. It is based upon JavaScript syntax but is distinct from it: some JavaScript is not JSON, and some JSON is not JavaScript. See also JSON: The JavaScript subset that isn't. The full JSON syntax is as follows: JSON = null or true or false or JSONNumber or JSONString or JSONObject or JSONArray JSONNumber = - PositiveNumber or PositiveNumber PositiveNumber = DecimalNumber or DecimalNumber . Insignificant whitespace may be present anywhere except within a (numbers must contain no whitespace) or (where it is interpreted as the corresponding character in the string, or would cause an error).
MethodsEdit JSON.parse() JSON.stringify()
Guía JavaScript 1.5. Examples. Cookies. BOM (Browser Object Model) Cursos. Expresiones regulares. Debugging. OO JavaScript. ECMAScript Language Specification - ECMA-262 Edition 5.1. Mozilla JavaScript reference. Mozilla JavaScript. JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat.
JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles. JavaScript's dynamic capabilities include runtime object construction, variable parameter lists, function variables, dynamic script creation (via eval), object introspection (via for...in and Object utilities), and source-code recovery (JavaScript functions store their source text and can be retrieved through toString()). This section is dedicated to the JavaScript language itself, and not the parts that are specific to Web pages or other host environments.
Looking to become a front-end web developer? Get started. Basic JavaScript for the impatient programmer. This blog post enables you to get started with JavaScript as quickly as possible – if you already know how to program. It describes the smallest subset of the language that allows you to be productive. I call that subset “Basic JavaScript” and recommend to program in it for a while, before moving on to more details and advanced topics. Learning everything at once is too confusing. The post concludes with tips for what to learn next. Warning: Below, I’m describing rules of thumbs and best practices. I favor clarity over precision (e.g., whenever you see the word “roughly”). The rules are safe, but – unavoidably – a matter of taste. Table of contents Conventions used in this blog post Command line interaction Whenever I introduce a new concept, I also try to illustrate it via an interaction in a JavaScript command line.
The text after the greater-than character is the input, typed by a human. Finding documentation mdn array push The nature of the language JavaScript versus ECMAScript Influences. JavaScript Video Courses and Tutorials from lynda.com. Become a Professional JavaScript Developer with Tuts+ Courses. A long time ago, in a galaxy far, far away, JavaScript was a hated language. In fact, “hated” is an understatement; JavaScript was a despised language. As a result, developers generally treated it as such, only tipping their toes into the JavaScript waters when they needed to sprinkle a bit of flair into their applications.
Despite the fact that there is a whole lot of good in the JavaScript language, due to widespread ignorance, few took the time to properly learn it. Ironically, it turns out that much of what the development community hated had very little to do with the JavaScript language itself. Luckily, the community has matured immensely since those days. The Basics As a first step into these waters, an understanding of the fundamentals will prove essential. JavaScript FundamentalsWithout a doubt, JavaScript is the most popular programming language in the world. Advanced JS FundamentalsThis follow-up course will focus on DOM scripting and events. The Wonder of jQuery Tools. The W3C Markup Validation Service.
Compatibility Master Table. Javascript Interview Questions. Dos and Don’ts in JavaScript. A few best practices for when you’re learning the language With every programming language, there’s a list of do’s and don’ts and JavaScript is no exception. Some of these best practices are there for your protection (like always always always using semi-colons!) , some to make your code more readable and less error-prone, and some to increase the efficiency of your code. If you search for “best practices JavaScript” you’ll find lots of great information on the topic. You’ll also find a few disagreements (for instance, always use comma separated variable declarations vs. never use comma separated variable declarations).
That said, there are some fundamental best practices that can really help you write better code. In this installment of Head First JavaScript Programming Teasers, we take a look at a few common best practices that will help make your code more readable, make the best use of the language, and make your code a bit more efficient. TodoMVC.