I would like to describe the solutions I want to use before comparing, here’s my ideal solution:
Javascript is an event driven language and this is the most important thing that makes node.js an awesome toolkits. Javascript works like human. For example if there are 5 things to do, they are
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What is a callback? A callback is a function to be executed after another function is executed. Sounds tongue-twisted? Normally if you want to call function do_b after function do_a the code looks something like
For a long time javascript call and apply have been really confusing me. I neither know when to use it nor what are the differences between these two.
Basically call and apply invoke the function and switch the function context with the first argument. The main difference between these two is with call the rest arguments are passed to the calling function and those arguments have to be listed explicitly. However with apply the amount of arguments don’t have to be predefined. we can pass in an array.
We’ve talked about scopes and closures, this points to the current scope object. In client side the highest scope is window and in node.js the highest scope is the global objects.
Javascript is a pretty free language. You can either code in functional programming style or object oriented programming style. With functional programming you pass variables and callbacks around. this is quite useless. However with OOP this is a must.
Javascript uses function as scope. Declare a function inside another function creates a different scope. Let’s look at the example code below.
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After setting up n node.js development environment, you need to know some basic commands of node package manager npm. The followings are the most commonly used ones.
After setting up the node.js development environment and know some common uses of npm commands. It’s time to learn the basics of javascript and node.js.
Examples and source are available on github
I met James Hill on a RGBA meet up in mid of this year and he invited Felix, ihower and me to join Startup Weekend Taipei in Aug.
So what is Startup Weekend? It is a 2 days event for entrepreneurs to share new ideas and to turn them into products within 54 hours.
There are several ways to setup a node.js development environment on Ubuntu, you can either choose to download and compile it form source or using apt-get to do the works for you. Because node.js is still a pretty young project, it updates frequently. I suggest installing node.js via apt-get. You will find it is much easier not only to install but also update it. If you are on a Mac you can check out this post for the instruction.
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