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How can I generate an MD5 hash?
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You need java.security.MessageDigest.
Call MessageDigest.getInstance("MD5") to get a MD5 instance of MessageDigest you can use.
The compute the hash by doing one of:
Feed the entire input as a byte[] and calculate the hash in one operation ...
How do I get an ISO 8601 date on iOS?
It's easy enough to get the ISO 8601 date string (for example, 2004-02-12T15:19:21+00:00 ) in PHP via date('c') , but how does one get it in Objective-C (iPhone)? Is there a similarly short way to do it?
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How do I create a new Swift project without using Storyboards?
...vigationController?
Swift classes require non-optional properties to be initialized during the instantiation:
Classes and structures must set all of their stored properties to an appropriate initial value by the time an instance of that class or structure is created. Stored properties cannot be le...
How do I get the currently displayed fragment?
I am playing with fragments in Android.
50 Answers
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What is the use of making constructor private in a class?
...nstructor can only be accessed from static factory method inside the class itself. Singleton can also belong to this category.
A utility class, that only contains static methods.
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Real-world examples of recursion [closed]
... are lots of mathy examples here, but you wanted a real world example, so with a bit of thinking, this is possibly the best I can offer:
You find a person who has contracted a given contageous infection, which is non fatal, and fixes itself quickly( Type A) , Except for one in 5 people ( We'll call...
How do I find the .NET version?
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edited Apr 23 '17 at 11:25
Peter Mortensen
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What is the most efficient way to concatenate N arrays?
... can be used instead to add elements from one array to the end of another without producing a new array. With slice() it can also be used instead of concat() but there appears to be no performance advantage from doing this.
var a = [1, 2], b = ["x", "y"];
a.push.apply(a, b);
console.log(a); // [1, ...
JavaScript % (modulo) gives a negative result for negative numbers
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edited Mar 13 '19 at 11:15
Martijn Pieters♦
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defaultdict of defaultdict?
...alled when you try to access a key that doesn't exist. The return value of it will be set as the new value of this key, which means in our case the value of d[Key_doesnt_exist] will be defaultdict(int).
If you try to access a key from this last defaultdict i.e. d[Key_doesnt_exist][Key_doesnt_exist]...