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Evaluating a mathematical expression in a string
...he above code has only been tested on Python 3.
If desired, you can add a timeout decorator on this function.
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error: passing xxx as 'this' argument of xxx discards qualifiers
...assumption that getId() might attempt to modify the object but at the same time, it also notices that the object is const; so any attempt to modify the const object should be an error. Hence compiler generates an error message.
The solution is simple: make the functions const as:
int getId() cons...
What does middleware and app.use actually mean in Expressjs?
...sn't do anything unless you handle it. Express will handle the stack every time an incoming HTTP request is caught on the server. With middleware you handle the stack manually.
// express, you need to do nothing
// middleware
stack.handle(someData);
A more complete example :
var middleware = req...
How can mixed data types (int, float, char, etc) be stored in an array?
...nated union, disjoint union, or sum type, ... It's been reinvented so many times it has many names (kind of like dictionaries, hashes, associative arrays, etc.).
– Barmar
Sep 2 '13 at 17:40
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Check whether a string is not null and not empty
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@user1154390: sometimes its worth explicitly using true and false for clarity, but when condition returns true for true and false for false, its unnecessary complexity. Simply say (str != null && str.length() > 0).
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1030 Got error 28 from storage engine
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Nice Answer. It saved my lots of time. +1
– Pratik Soni
Jun 24 '16 at 6:42
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Difference between break and continue statement
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Break Statement
Sometimes it’s necessary to exit a loop before the loop has finished fully iterating over all the step values. For example, looping over a list of numbers until you find a number that satisfies a certain condition. Or looping o...
Is Hash Rocket deprecated?
...0,1,4,9] vs. a = Array.new(4){ |i| i**2 }. Why use the former when you sometimes need to use the latter? Answer: because it's more convenient. TIMTOWTDI does complicate the language, but this is a tradeoff. Lua is really elegant at the core and hence easy to learn, but annoying to actually code in. ...
What does HTTP/1.1 302 mean exactly?
... which is no longer relevant nowadays. Quoting Mark Nottingham who, at the time of writing, co-chairs the IETF HTTP and QUIC Working Groups:
Don’t use RFC2616. Delete it from your hard drives, bookmarks, and burn (or responsibly recycle) any copies that are printed out.
The old RFC 2616 has ...
Delete an element from a dictionary
...a copy for every dict del/assignment/etc. means you're going from constant time to linear time, and also using linear space. For small dicts, this is not a problem. But if you're planning to make lots of copies of large dicts, you probably want a different data structure, like a HAMT (as described i...