I don't fully get what Node.js is all about. Maybe it's because I am mainly a web based business application developer. What is it and what is the use of it?  My understanding so far is that:   The programming model is event driven,...
I am looking into Javascript programming without a browser. I want to run scripts from the Linux or Mac OS X command line, much like we run any other scripting language (ruby, php, perl, python...)  $ javascript my_javascript_code.js   I looked int...
A previous poster asked Function.bind vs Closure in Javascript : how to choose?  and received this answer in part, which seems to indicate bind should be faster than a closure:     Scope traversal means, when you are reaching to grab a value   (var...
I want to run a Javascript console on top of V8. How do I do this?...
I'm doing a project in Node.js using express. Here's my directory structure:  root |-start.js |-server.js |-lib/ |    api/ |        user_getDetails.js |        user_register.js   The lib/api/ directory has a number of JS files relating to the...
Regardless of functional differences, does using the new keywords 'let' and 'const' have any generalized or specific impact on performance relative to 'var'?  After running the program:  function timeit(f, N, S) {     var star...
I was writing some random code in the chrome developer console. For my surprise, chrome let me use let as a variable name which is completely wrong as let is a reserved keyword. I need to understand why is this happening.  Scenarios:  var const = 78...
If I remove one element from an array using splice() like so:  arr.splice(i, 1);   Will this be O(n) in the worst case because it shifts all the elements after i? Or is it constant time, with some linked list magic underneath?...
The difference between a javascript Array, and Object is not very big. In fact it seems Array mainly adds the length field, so you can use both Arrays and Objects as numeric arrays:  var ar = new Array(); ar[0] = "foo"; ar["bar"] = &#...
So I have this simple code:  function Run () {   var n = 2*1e7;   var inside = 0;   while (n--) {     if (Math.pow(Math.random(), 2) +         Math.pow(Math.random(), 2) < 1)       inside++;   }    return inside; }  var start = Date.now(); Run();...

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