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Why is it important to override GetHashCode when Equals method is overridden?
...kets. If the hash-code for two items does not match, they may never be considered equal (Equals will simply never be called).
The GetHashCode() method should reflect the Equals logic; the rules are:
if two things are equal (Equals(...) == true) then they must return the same value for GetHashCode...
Create request with POST, which response codes 200 or 201 and content
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The idea is that the response body gives you a page that links you to the thing:
201 Created
The 201 (Created) status code indicates that the request has been fulfilled and has resulted in one or more new resources being...
Use numpy array in shared memory for multiprocessing
...lready given are good, there is a much easier solution to this problem provided two conditions are met:
You are on a POSIX-compliant operating system (e.g. Linux, Mac OSX); and
Your child processes need read-only access to the shared array.
In this case you do not need to fiddle with explicitly ...
Counting the number of option tags in a select tag in jQuery
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The W3C solution:
var len = document.getElementById("input1").length;
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Difference between @OneToMany and @ElementCollection?
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Thanks Peder for the answer! You've a valid point there since @OneToMany can only relate entities.
– n_g
Jan 23 '12 at 9:03
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How can I return the current action in an ASP.NET MVC view?
... route data (controller, action) in your view even if the other answer provides more detail on how to get that data.
– tvanfosson
Apr 28 '16 at 12:34
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Why dict.get(key) instead of dict[key]?
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It allows you to provide a default value if the key is missing:
dictionary.get("bogus", default_value)
returns default_value (whatever you choose it to be), whereas
dictionary["bogus"]
would raise a KeyError.
If omitted, default_value is...
form_for but to post to a different action
...done it like that
<%= form_for :user, url: {action: "update", params: {id: @user.id}} do |f| %>
Note the optional parameter id set to user instance id attribute.
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Rails filtering array of objects by attribute value
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As @Vik's solution is pretty much ideal, I'll just add that in binary cases, you could use a 'partition' function to make things sweet. ruby-doc.org/core-1.9.3/Enumerable.html#method-i-partition
– Vlad
Jun 20 '16 at 21:...
Why can a function modify some arguments as perceived by the caller, but not others?
... @MarkRansom, I think it does make sense if you want to provide optional output destination as in: def foo(x, l=None): l=l or []; l.append(x**2); return l[-1].
– Janusz Lenar
Aug 31 '12 at 13:03
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