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setState vs replaceState in React.js
I am new to React.js Library and I was going over some of the tutorials and I came across:
4 Answers
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How to merge 2 JSON objects from 2 files using jq?
... this is now possible with the * operator. When given two objects, it will merge them recursively. For example,
jq -s '.[0] * .[1]' file1 file2
Important: Note the -s (--slurp) flag, which puts files in the same array.
Would get you:
{
"value1": 200,
"timestamp": 1382461861,
"value": {
...
When do you use Java's @Override annotation and why?
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Use it every time you override a method for two benefits. Do it so that you can take advantage of the compiler checking to make sure you actually are overriding a method when you think you are. This way, if you make a common mistake of mi...
How do you run your own code alongside Tkinter's event loop?
...his code written, and it works nicely, but the birds need to move every moment .
5 Answers
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Adding additional data to select options using jQuery
...ata('foo');
...
});
});
// Plain old JavaScript
var sel = document.getElementById('select');
var selected = sel.options[sel.selectedIndex];
var extra = selected.getAttribute('data-foo');
See this as a working sample using jQuery here: http://jsfiddle.net/GsdCj/1/
See this as a working...
Is it OK to leave a channel open?
... (never close the channel) if I never check for its state? Will it lead to memory leaks? Is the following code OK?
5 Answer...
String formatting in Python 3
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"({} goals, ${})".format(self.goals, self.penalties)
And since the parameters are fields of self, there's also a way of doing it using a single argument twice (as @Burhan Khalid noted in the comments):
"({0.goals} goals, ${0.penalties})".format(self)
Explaining:
{} means just the next posit...
Aren't promises just callbacks?
...way you do, you get little benefit. But if you write them the way they are meant to be used, you can write asynchronous code in a way that resembles synchronous code and is much more easy to follow:
api().then(function(result){
return api2();
}).then(function(result2){
return api3();
}).the...
How to validate IP address in Python? [duplicate]
...'s the best way to validate that an IP entered by the user is valid? It comes in as a string.
11 Answers
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What requirement was the tuple designed to solve?
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When writing programs it is extremely common to want to logically group together a set of values which do not have sufficient commonality to justify making a class.
Many programming languages allow you to logically group together a set of otherwise unrela...