Learning Node.js by Marc Wandschneider

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By Marc Wandschneider

Node.js makes it a long way more straightforward to create quick, compact, and trustworthy web/network functions and net servers, and is quickly turning into crucial to fashionable net developers.

Learning Node.js brings jointly the data and JavaScript code you want to construct grasp the Node.js platform and construct server-side purposes with notable velocity and scalability.

You'll commence by means of fitting and operating Node.js, knowing the extensions it makes use of, and speedy writing your first app. subsequent, development at the fundamentals, you'll write extra able program servers and expand them with today's strongest Node.js instruments and modules. ultimately, you'll detect today's most sensible practices for trying out, working Node.js code on construction servers, and writing command-line utilities.

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Extra resources for Learning Node.js

Sample text

Js changes the method demonstrated in the preceding section into a nonblocking, asynchronous model, first look at the setTimeout function in JavaScript.

Js And you should see this output: Hello World! Because you are not in the Node shell, you don’t get any information on the return values of the code executed. Your First Web Server You’re ready to write something a bit more interesting now and create a little web server. Fortunately, Node makes this task extremely easy. info 17 18 Chapter 1 Getting Started Your computer now has a web server running on port 8080. To test it, you can use the command-line program curl, which most Mac and Linux machines have pre-installed.

Suppose you want to initialize a caching subsystem you wrote. The function to do this takes a size to create the cache and uses default values for other things such as cache location, expiration algorithm, maximum cache item size, and storage type. You could write the function as follows: function init_cache(size_mb, location, algorithm, item_size, storage_type) { ... info Functions break; } else { throw new Error("bad cache init param"); } } // etc } Now you have a number of different ways you can call this function: init_cache(); init_cache(200); init_cache({ cache_size: 100, location: '/exports/dfs/tmp', algorithm: 'lruext', item_size: 1024, storage_type: 'btree'} ); Functions in JavaScript do not even need to have names: var x = function (a, b) { return a + b; } > x(10, 20); 30 These nameless functions are typically called anonymous functions.

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