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convert '1' to '0001' in JavaScript [duplicate]
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This is a clever little trick (that I think I've seen on SO before):
var str = "" + 1
var pad = "0000"
var ans = pad.substring(0, pad.length - str.length) + str
JavaScript is more forgiving than some languages if the second argument to substring is negative so it will "overflow correc...
Polymorphism vs Overriding vs Overloading
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The clearest way to express polymorphism is via an abstract base class (or interface)
public abstract class Human{
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public abstract void goPee();
}
This class is abstract because the goPee() method is not definable for Humans. It is only definab...
What is the difference between packaged_task and async
While working with the threaded model of C++11, I noticed that
3 Answers
3
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How to programmatically close a JFrame
What's the correct way to get a JFrame to close, the same as if the user had hit the X close button, or pressed Alt + F4 (on Windows)?
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What is the recommended way to delete a large number of items from DynamoDB?
...m(user_id) -
Without supplying the range, and have it delete everything for me.
An understandable request indeed; I can imagine advanced operations like these might get added over time by the AWS team (they have a history of starting with a limited feature set first and evaluate extensions based...
NoSQL Use Case Scenarios or WHEN to use NoSQL [closed]
With all the hype it seems really hard to find reliable information on when to use this. So I pose the following questions, and I'm sorry if these are really dumb questions in advance:
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How to validate a url in Python? (Malformed or not)
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django url validation regex (source):
import re
regex = re.compile(
r'^(?:http|ftp)s?://' # http:// or https://
r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|' #domain...
r'localhost|' #localhost...
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Differences between Exception and Error
I'm trying to learn more about basic Java and the different types of Throwables, can someone let me know the differences between Exceptions and Errors?
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Handler vs AsyncTask vs Thread [closed]
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As the Tutorial on Android background processing with Handlers, AsyncTask and Loaders on the Vogella site puts it:
The Handler class can be used to register to a thread and provides a simple channel to send data to this thread.
The A...
What is a 'Closure'?
...riable has a scope. Generally, local variables exist only within the block or function in which you declare them.
function() {
var a = 1;
console.log(a); // works
}
console.log(a); // fails
If I try to access a local variable, most languages will look for it in the current scope, then up ...