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Why does Enumerable.All return true for an empty sequence? [duplicate]
... thing I check when a function doesn't behave as I expect. Invariably someone with a huge reputation like Jon Skeet not only finds the pertinent snippet of documentation but also explains why my expectations were wrong to begin with. We're spoiled by SO...
– ThisGuy
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Why is processing a sorted array slower than an unsorted array?
...cy. A memory access can stall the CPU for 50-200 cycles. Given that number one could expect the program to become >10x slower when introducing random memory accesses.
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How to create a MySQL hierarchical recursive query
... if the pv string would for some reason yield a falsy value.
All in all, one may find these assumptions too risky to rely on. The documentation warns:
you might get the results you expect, but this is not guaranteed [...] the order of evaluation for expressions involving user variables is und...
Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
...thon installed, /usr/bin/env will ensure the interpreter used is the first one on your environment's $PATH. The alternative would be to hardcode something like #!/usr/bin/python; that's ok, but less flexible.
In Unix, an executable file that's meant to be interpreted can indicate what interpreter t...
Finding Key associated with max Value in a Java Map
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+1: You can have more than one key with the same maximum value. This loop will give you the first one it finds.
– Peter Lawrey
May 6 '11 at 12:19
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How to convert an int value to string in Go?
...do the job. But Sprintf will use the package reflect, and it will allocate one more object, so it's not an efficient choice.
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What is the difference between syntax and semantics in programming languages?
...ion at address x".
If x is a scalar, the meaning of the statement is "add one to the value at address x and store the result into the location at address x".
Finally, note that some semantics cannot be determined at compile-time and must therefore must be evaluated at run-time. In the ++ operator...
converting CSV/XLS to JSON? [closed]
Does anyone know if there is application that will let me convert preferably XLS to JSON?
10 Answers
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What is a coroutine?
...ollaborative: at any given time, a program with coroutines is running only one of its coroutines, and this running coroutine suspends its execution only when it explicitly requests to be suspended.
So the point is: Coroutines are "collaborative". Even in multi-core system, there is only one coro...
Interactive search/replace regex in Vim?
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I'm honestly not trying to come across as snarky, but all of this could have been found by doing ":help :s" which would have led you straight to ":help :s_flags".
– Jeremy Cantrell
Feb 5 '09 ...