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Class vs. static method in JavaScript
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First off, remember that JavaScript is primarily a prototypal language, rather than a class-based language1. Foo isn't a class, it's a function, which is an object. You can instantiate an object from that function using the new keyword which will allow y...
JavaScript variables declare outside or inside loop?
...riables outside loops for increased performance. Is this the case with JavaScript as well? Which is better / faster / best-practice?
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VIP会员中心 · App Inventor 2 中文网，少儿编程陪伴者
... var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?8d287b854d737bdc880e8ddeac1b309d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })();
What is the purpose of setting a key in data.table?
... 20,000 joins like this on a full table of zip codes. With data tables the script took about 20 min. to run. I didn't even try it with data frames because it would have taken more than 2 weeks.
IMHO you should not just read but study the FAQ and Intro material. It's easier to grasp if you have an a...
How to parse JSON using Node.js? [closed]
...ply use JSON.parse.
The definition of the JSON object is part of the ECMAScript 5 specification. node.js is built on Google Chrome's V8 engine, which adheres to ECMA standard. Therefore, node.js also has a global object JSON[docs].
Note - JSON.parse can tie up the current thread because it is a ...
Is there any way to view the currently mapped keys in Vim?
... and avoid temp files whenever you need to search mappings, take a look to scriptease and :Verbose command.
It is a wrapper on :verbose to show result in a preview window.
this way you can search whatever you want inside results without using temp files
type :Verbose map and use / ? as usual.
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Calculate distance between 2 GPS coordinates
...istance between two coordinates by latitude and longitude, including a Javascript implementation.
West and South locations are negative.
Remember minutes and seconds are out of 60 so S31 30' is -31.50 degrees.
Don't forget to convert degrees to radians. Many languages have this function. Or it...
Is there “0b” or something similar to represent a binary number in Javascript
I know that 0x is a prefix for hexadecimal numbers in Javascript. For example, 0xFF stands for the number 255.
10 Answe...
Regex to validate date format dd/mm/yyyy
...you can test regular expression at http://www.regular-expressions.info/javascriptexample.html easily.
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How is Docker different from a virtual machine?
...el. That will clear up lot of things.
Note: I'm simplifying a bit in the description below. See references for more information.
How does virtualization work at a low level?
In this case the VM manager takes over the CPU ring 0 (or the "root mode" in newer CPUs) and intercepts all privileged calls m...