Download PDF by Li Wenbo: Opa Application Development

By Li Wenbo

Preface

Opa program improvement dives into the entire strategies and elements required to construct an internet program with Opa. the 1st 1/2 this e-book exhibits the elemental development blocks that you'll want to strengthen an Opa software, together with the syntax of Opa, internet improvement points, purchaser and server conversation, in addition to cutting, plugins, databases, and so on.

Opa is a full-stack open resource net improvement framework for JavaScript that permits you to write safe and scalable net purposes. It generates the normal Node.js and MongoDB functions, natively helps HTML5 and CSS, and automates many points of contemporary net program programming. It handles all elements of net programming written in a single constant language and is compiled to net standards.

This booklet is a realistic, hands-on advisor that offers you with a couple of step by step routines. It covers just about all the facets of constructing an internet software with Opa, with the intention to assist you make the most of the true strength of Opa to construct safe and robust internet purposes rapidly.

Required wisdom for this publication is as follows:

•Basic wisdom approximately HTML and CSS
•Basic wisdom approximately JavaScript
•Some programming experience

Software required for this ebook is as follows:

•Node.js
•The Opa framework
•MongoDB
•A textual content editor device, SublimeText is suggested

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Sample text

A JavaScript identifier is a word that contains only letters, numbers, $, and _, and that doesn’t start with a number. Variables are a great demonstration of how statements and expressions can be combined. You use a variable declaration statement to create a variable. var myVariable; If you already have a variable, you can use a variable assignment expression to assign it a value. myVariable = 42; 42 You can combine a variable declaration with an assignment expression. var myVariable = 42; You can also string together several variable declarations with commas.

Log(sideC); 5 In JavaScript, functions are just another data type, so you can assign a function to a variable. Chapter 1: JavaScript Basics 9 var myFunc = function() { return 42; }; typeof myFunc; "function" myFunc(); 42 Functions are also an incredibly useful tool for organizing your code and acting upon values. You’ll use them throughout the first few chapters before exploring them in more depth in Chapter 5. Objects Objects are so fundamental to JavaScript that it is considered an objectoriented language.

Var myString = "hello world"; // If the string does *not* contain the substring: if (! log("String contains 'hello'"); } In the first example of the previous code, indexOf() doesn’t find the substring and returns -1, which is a “truthy” value. ) operator, it does the opposite of what I expect. In the second example of the previous code, indexOf() finds the substring at position 0, which is a “falsey” value. Because the substring is the start of myString, this test also does the opposite of what I expect.

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