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Check synchronously if file/directory exists in Node.js
... Or `import fs from "fs";` with ESM
if (fs.existsSync(path)) {
// Do som>me m>thing
}
It was deprecated for several years, but no longer is. From the docs:
Note that fs.exists() is deprecated, but fs.existsSync() is not. (The
callback param>me m>ter to fs.exists() accepts param>me m>ters that are
inc...
Why are there two kinds of functions in Elixir?
...
Just to clarify the naming, they are both functions. One is a nam>me m>d function and the other is an anonymous one. But you are right, they work som>me m>what differently and I am going to illustrate why they work like that.
Let's start with the second, fn. fn is a closure, similar to a lambda in...
How do I pass a variable by reference?
The Python docum>me m>ntation seems unclear about whether param>me m>ters are passed by reference or value, and the following code produces the unchanged value 'Original'
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Why do this() and super() have to be the first statem>me m>nt in a constructor?
... if you call this() or super() in a constructor, it must be the first statem>me m>nt. Why?
19 Answers
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Using a strategy pattern and a command pattern
Both design patterns encapsulate an algorithm and decouple implem>me m>ntation details from their calling classes. The only difference I can discern is that the Strategy pattern takes in param>me m>ters for execution, while the Command pattern doesn't.
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What does the brk() system call do?
According to Linux programm>me m>rs manual:
8 Answers
8
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How to iterate over rows in a DataFram>me m> in Pandas
I have a DataFram>me m> from Pandas:
22 Answers
22
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Are static variables shared between threads?
My teacher in an upper level Java class on threading said som>me m>thing that I wasn't sure of.
7 Answers
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'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?
...ogically True. This facilitates the common use case where you want to do som>me m>thing if a list is empty and som>me m>thing else if the list is not. Note that this m>me m>ans that the list [False] is logically True:
>>> if [False]:
... print 'True'
...
True
So in Example 1, the first list is non-e...
C# switch statem>me m>nt limitations - why?
When writing a switch statem>me m>nt, there appears to be two limitations on what you can switch on in case statem>me m>nts.
17 Answe...