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What is null in Java?
...ceof operator is true if the value of the RelationalExpression is not null and the reference could be cast to the ReferenceType without raising a ClassCastException. Otherwise the result is false.
This means that for any type E and R, for any E o, where o == null, o instanceof R is always false.
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Analyze audio using Fast Fourier Transform
...you need to calculate the square root of the sum of the square of its real and imaginary components. That is, if your coefficient is a + b*j, then its magnitude is sqrt(a^2 + b^2).
Once you have calculated the magnitude of each FFT coefficient, you need to figure out which audio frequency each FFT ...
Lock, mutex, semaphore… what's the difference?
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A lock allows only one thread to enter the part that's locked and the lock is not shared with any other processes.
A mutex is the same as a lock but it can be system wide (shared by multiple processes).
A semaphore does the same as a mutex but allows x number of threads to enter, this...
float:left; vs display:inline; vs display:inline-block; vs display:table-cell;
... we can do about that now though. But the important thing is it does work, and it works in all browsers (even IE6/7), so use it if you like it.
The additional markup for clearing may not be necessary if you use the :after selector to clear the floats, but this isn't an option if you want to suppor...
Multidimensional Array [][] vs [,] [duplicate]
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One is an array of arrays, and one is a 2d array. The former can be jagged, the latter is uniform.
That is, a double[][] can validly be:
double[][] x = new double[5][];
x[0] = new double[10];
x[1] = new double[5];
x[2] = new double[3];
x[3] = new d...
Quick Sort Vs Merge Sort [duplicate]
...e its inner loop can
be efficiently implemented on most
architectures, and in most real-world
data, it is possible to make design
choices which minimize the probability
of requiring quadratic time.
Note that the very low memory requirement is a big plus as well.
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How to manually send HTTP POST requests from Firefox or Chrome browser?
... documenting our own API here.
Postman now also has native apps (i.e. standalone) for Windows, Mac and Linux! It is more preferable now to use native apps, read more here.
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Go Error Handling Techniques [closed]
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Your code is idiomatic and in my opinion it is the best practice available. Some would disagree for sure, but I would argue that this is the style seen all over the standard libraries in Golang. In other words, Go authors write error handling in th...
How to edit a node module installed via npm?
...to the source.
If the changes affect functionality of the overall module, and may be useful to others, you may want to contribute to the original source on github and look for the change to be implemented.
If this is proprietary functionality that is needed, and would not help the development of t...
How to calculate a Mod b in Casio fx-991ES calculator
...ect ab/c (number 1).
Now do your calculation (in comp mode), like 50 / 3 and you will see 16 2/3, thus, mod is 2. Or try 54 / 7 which is 7 5/7 (mod is 5).
If you don't see any fraction then the mod is 0 like 50 / 5 = 10 (mod is 0).
The remainder fraction is shown in reduced form, so 60 / 8 will r...