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When to use ' (or quote) in Lisp?
...g like this (slightly prettyfied):
'((allocate 3)
(allocate 7)
(free 14)
(allocate 19)
...)
Remember what I said about quote ("tick") causing the default rule not to apply? Good. What would otherwise happen is that the values of allocate and free are looked up, and we don't want that. In...
How can I check for NaN values?
...|
edited Jul 22 '19 at 11:42
Boris
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answered Jun ...
How to sort an array of integers correctly
...h handles numeric sorts (sortNumber, shown below) -
var numArray = [140000, 104, 99];
numArray.sort(function(a, b) {
return a - b;
});
console.log(numArray);
In ES6, you can simplify this with arrow functions:
numArray.sort((a, b) => a - b); // For ascending sort
numArray.so...
Using .NET, how can you find the mime type of a file based on the file signature not the extension
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84
In Urlmon.dll, there's a function called FindMimeFromData.
From the documentation
MIME typ...
How to get hex color value rather than RGB value?
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142
var hexDigits = new Array
("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e",...
Core Data: Quickest way to delete all instances of an entity
...und in the "What's New in Core Data" session from WWDC 2015 (starting at ~14:10).
iOS 8 and earlier:
Fetch 'em all and delete 'em all:
NSFetchRequest *allCars = [[NSFetchRequest alloc] init];
[allCars setEntity:[NSEntityDescription entityForName:@"Car" inManagedObjectContext:myContext]];
[allCars...
How do I detect whether a Python variable is a function?
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934
If this is for Python 2.x or for Python 3.2+, you can also use callable(). It used to be depreca...
How to format date and time in Android?
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24 Answers
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Programmatically get height of navigation bar
...bar) pushes down the UIView by its height. I also know that this height = 44px. I have also discovered that this push down maintains the [self.view].frame.origin.y = 0 .
...
Android Studio with Google Play Services
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243
All those answers are wrong, since the release of gradle plugin v0.4.2 the setup of google play...