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Rails extending ActiveRecord::Base
...the ActiveSupport::Concern documentation for more details.
Create a file called active_record_extension.rb in the lib directory.
require 'active_support/concern'
module ActiveRecordExtension
extend ActiveSupport::Concern
# add your instance methods here
def foo
"foo"
end
# add y...
Why do you need to invoke an anonymous function on the same line?
...ition. Because it has no name (it's anonymous duh!), you won't be able to call it anymore. If you don't put semicolon then function could still be executed.
– SolutionYogi
Jul 16 '09 at 20:32
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How does variable assignment work in JavaScript?
..., will modify the object that a points to. This, of course, also modifies all other references that point to this object simply because they all point to the same object.
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Does Typescript support the ?. operator? (And, what's it called?)
...
Update: it is supported as of TypeScript 3.7 and called Optional chaining: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#optional-chaining
I can't find any reference to it whatsoever in the TypeScript language specification.
As far as what ...
What does “atomic” mean in programming?
...eans an operation that appears to be instantaneous from the perspective of all other threads. You don't need to worry about a partly complete operation when the guarantee applies.
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Is it good practice to NULL a pointer after deleting it?
...d to achieve in practice. I prefer a masked double delete bug over UB.
Finally, a sidenote regarding managing object allocation, I suggest you take a look at std::unique_ptr for strict/singular ownership, std::shared_ptr for shared ownership, or another smart pointer implementation, depending on yo...
Remove all classes that begin with a certain string
... know which class from the group is on the div. I want to be able to clear all classes with a given prefix and then add a new one. If I want to remove all of the classes that begin with "bg", how do I do that? Something like this, but that actually works:
...
How do I parse command line arguments in Bash?
Say, I have a script that gets called with this line:
37 Answers
37
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Is std::vector copying the objects with a push_back?
...e name of an entity declared as rvalue reference, then the argument is actually an lvalue and will not be moved from) - check my edit to the answer of "Karl Nicoll" which made that mistake initially
– M.M
Apr 16 '17 at 0:17
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Sorting dictionary keys in python [duplicate]
...
[v[0] for v in sorted(foo.items(), key=lambda(k,v): (v,k))]
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