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What do you call the -> operator in Ruby?
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=> == Hash Rocket
Separates keys from values in a hash map literal.
-> == Dash Rocket
Used to define a lambda literal in Ruby 1.9.X (without args) and Ruby 2.X (with args). The examples you give (->(x) { x * 2 } & lambda { |x| x * 2 }) are in fact...
MySQL: Can't create table (errno: 150)
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From the MySQL - FOREIGN KEY Constraints Documentation:
If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it. It must have the correct column nam...
Get key by value in dictionary
... a list of pairs would discard the context that one item is a 'definition' from the other, e.g. in parameter lists...
– Louis Maddox
Oct 13 '16 at 13:20
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HTTP 1.0 vs 1.1
...s a new return code in HTTP/1.1 100 Continue. This is to prevent a client from sending a large request when that client is not even sure if the server can process the request, or is authorized to process the request. In this case the client sends only the headers, and the server will tell the clie...
initialize a numpy array
... know how big the array will end up being. For example, when reading data from a file or another process. It isn't really as awful as it may seem at first since python and numpy are pretty clever.
– travc
Feb 9 '13 at 22:55
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How to determine whether a Pandas Column contains a particular value
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Starting from pandas 0.24.0 , using s.values and df.values is highly discoraged. See this. Also, s.values is actually much slower in some cases.
– Qusai Alothman
Feb 1 '19 at 7:09
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Render Partial View Using jQuery in ASP.NET MVC
...he below, we have a button click handler that loads the url for the action from a data attribute on the button and fires off a GET request to replace the DIV contained in the partial view with the updated contents.
$('.js-reload-details').on('click', function(evt) {
evt.preventDefault();
ev...
Updating packages in Emacs
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package-refresh-contents unconditionally tries to download a package list from all repos you've added to package-archives; package-archive-contents is non nil if you have already downloaded the package list.
ELPA is the original. I don't think it's really maintained anymore, but I'm not sure. I d...
How to set a binding in Code?
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Your source should be just ViewModel, the .SomeString part is evaluated from the Path (the Path can be set by the constructor or by the Path property).
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Can we make unsigned byte in Java
...is unsigned".
As primitives are signed the Java compiler will prevent you from assigning a value higher than +127 to a byte (or lower than -128). However, there's nothing to stop you downcasting an int (or short) in order to achieve this:
int i = 200; // 0000 0000 0000 0000 0000 0000 1100 1000 (20...