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What is the difference between Amazon SNS and Amazon SQS?
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SNS is a distributed publish-subscribe system. Messages are pushed to subscribers as and when they are sent by publishers to SNS.
SQS is distributed queuing system. Messages are NOT pushed to receivers. Receivers have to poll o...
Why is the order in dictionaries and sets arbitrary?
I don't understand how looping over a dictionary or set in python is done by 'arbitrary' order.
6 Answers
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Creating range in JavaScript - strange syntax
I've run into the following code in the es-discuss mailing list:
4 Answers
4
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How to shorten my conditional statements
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Put your values into an array, and check if your item is in the array:
if ([1, 2, 3, 4].includes(test.type)) {
// Do something
}
If a browser you support doesn't have the Array#includes method, you can use this polyfill.
Short explanation of the ~ tilde shortcut:
U...
Is there a Python equivalent of the C# null-coalescing operator?
...me default value"
Ok, it must be clarified how the or operator works. It is a boolean operator, so it works in a boolean context. If the values are not boolean, they are converted to boolean for the purposes of the operator.
Note that the or operator does not return only True or False. Instead, i...
Android SQLite DB When to Close
I am working with a SQLite database on android. My database manager is a singleton and right now opens a connection to the database when it is initialized. It is safe to leave the database open the entire time so that when someone calls my class to work with the database it is already open? Or shoul...
What is the optimal length for an email address in a database?
Here is an extracted portion of my query, reflecting the EMAIL_ADDRESS column data type and property:
8 Answers
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Tactics for using PHP in a high-load site
Before you answer this I have never developed anything popular enough to attain high server loads. Treat me as (sigh) an alien that has just landed on the planet, albeit one that knows PHP and a few optimisation techniques.
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What is the difference between a reference type and value type in c#?
Some guy asked me this question couple of months ago and I couldn't explain it in detail. What is the difference between a reference type and a value type in C#?
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What is Express.js?
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This is over simplifying it, but Express.js is to Node.js what Ruby on Rails or Sinatra is to Ruby.
Express 3.x is a light-weight web application framework to help organize your web application into an MVC architecture on the ...