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How to check if a number is a power of 2
...0);
Well we already know that 4 != 0 evals to true, so far so good. But what about:
((4 & (4-1)) == 0)
This translates to this of course:
((4 & 3) == 0)
But what exactly is 4&3?
The binary representation of 4 is 100 and the binary representation of 3 is 011 (remember the & ...
How to allow only numeric (0-9) in HTML inputbox using jQuery?
...: it is really too risky playing with keycodes, because you cannot be sure what the keyboard layout is. For example, on French keyboards, users have to press shift in order to type numbers. So this code will not work at all. So please go for validation instead of this keycode hack.
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Are there any worse sorting algorithms than Bogosort (a.k.a Monkey Sort)? [closed]
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What's the big O of this? O(2^N)?
– Mooing Duck
Dec 14 '12 at 17:50
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How to state in requirements.txt a direct github source
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What I did not understand is that the syntax showed is exactly what goes in requirements, i.e. there is no package name before the -e.
– sage
Dec 22 '13 at 1:57
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Changing an element's ID with jQuery
...e whereas .prop retrieves the property that the attribute references (i.e. what you're actually intending to modify)
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Referencing another schema in Mongoose
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It sounds like the populate method is what your looking for. First make small change to your post schema:
var postSchema = new Schema({
name: String,
postedBy: {type: mongoose.Schema.Types.ObjectId, ref: 'User'},
dateCreated: Date,
comments: [{bo...
angularJS: How to call child scope function in parent scope
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That's pretty cool! But, what if you don't (want to) know where the caller scope is (I mean in $scope.$parent or in $scope.$parent.$parent, etc)? Ah, yes: pass a callback in params! :)
– user2173353
Jul 28 '14 a...
Keep CMD open after BAT file executes
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This is exactly what I was looking for, because I'm running the bat file at startup, not through a CMD command. +1
– Hawkeye
Oct 28 '16 at 15:41
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ASP.NET MVC Performance
...nd some wild remarks that ASP.NET MVC is 30x faster than ASP.NET WebForms. What real performance difference is there, has this been measured and what are the performance benefits.
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Can you animate a height change on a UITableViewCell when selected?
...redraw the cells, grabbing the new height value for the cell.... and guess what? It ANIMATES the change for you. Sweet.
I have a more detailed explanation and full code samples on my blog... Animate UITableView Cell Height Change
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