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Can hash tables really be O(1)?
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You have two variables here, m and n, where m is the length of the input and n is the number of items in the hash.
The O(1) lookup performance claim makes at least two assumptions:
Your objects can be equality compared in O(1) time.
There will be few hash collisions.
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What's the difference between a method and a function?
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A function is a piece of code that is called by name. It can be passed data to operate on (i.e. the parameters) and can optionally return data (the return value). All data that is passed to a function is explicitly passed.
A method is ...
What is a “thread” (really)?
...ind a good definition, and get an understanding, of what a thread really is.
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What's the difference between Perl's backticks, system, and exec?
Can someone please help me? In Perl, what is the difference between:
5 Answers
5
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Incrementing in C++ - When to use x++ or ++x?
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answered Nov 28 '09 at 16:47
Oliver FriedrichOliver F...
Is JavaScript a pass-by-reference or pass-by-value language?
...oth passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (when we consider that the variable to the object holds the object itself).
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Should I return a Collection or a Stream?
Suppose I have a method that returns a read-only view into a member list:
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Can overridden methods differ in return type?
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Java supports* covariant return types for overridden methods. This means an overridden method may have a more specific return type. That is, as long as the new return type is assignable to the return type of the method you are overriding, it's allowed.
For example:
class ShapeBuilder {
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How do I pass variables and data from PHP to JavaScript?
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There are actually several approaches to do this. Some require more overhead than others, and some are considered better than others.
In no particular order:
Use AJAX to get the data you need from the server.
Echo the data into the page somewhere, and use JavaScript t...
Best explanation for languages without null
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I think the succinct summary of why null is undesirable is that meaningless states should not be representable.
Suppose I'm modeling a door. It can be in one of three states: open, shut but unlocked, and shut and locked. Now I could model it along the lines of
c...