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Node.js - use of module.exports as a constructor
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CommonJS modules allow two ways to define exported properties. In either case you are returning an Object/Function. Because functions are first class citizens in JavaScript they to can act just like Objects (technically they are Objects). Tha...
List of Rails Model Types
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You can use the following basic field types in model scaffolding, all are supported in ActiveRecord supported databases without any extra gem (MySQL, PostgreSQL, SQLite):
:binary
:boolean
:date
:datetime
:decimal
:float
:integer
:primary_key
:string
:text
:time
:timestamp
In the scaffol...
Ruby Arrays: select(), collect(), and map()
...following:
details.select{ |item| item[:qty] != "" }
That will give you all items where the :qty key isn't an empty string.
official select documentation
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How to create your own library for Android development to be used in every program you write?
...e the same android library project, are two copies of the same library installed when both apps are installed on the same phone?
– enigmaticPhysicist
Jul 5 '14 at 7:36
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Are static class instances unique to a request or a server in ASP.NET?
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Your static classes and static instance fields are shared between all requests to the application, and has the same lifetime as the application domain. Therefore, you should be careful when using static instances, since you might have synchronization issues and the like. Also bear in mind,...
AngularJS ng-if with multiple conditions
... If I have 20 input fields and I have to enable submit button only if all fields are filled. In this case, I have to include so many conditions. This is little bit confusing. Is there any other feasible solution?
– Mr_Perfect
Dec 2 '16 at 5:14
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XPath: select text node
...t or
the second text node via XPath?
Use:
/node/text()
This selects all text-node children of the top element (named "node") of the XML document.
/node/text()[1]
This selects the first text-node child of the top element (named "node") of the XML document.
/node/text()[2]
This selects th...
What does gcc's ffast-math actually do?
...tside of IEEE standards, but I can't seem to find information on what is really happening when it's on. Can anyone please explain some of the details and maybe give a clear example of how something would change if the flag was on or off?
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Case insensitive Query with Spring CrudRepository
...meContainingIgnoreCase(String name);
}
See documentation for a list of all supported keywords inside method names.
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Change directory command in Docker?
... && \
rm -f treeio.zip && cd treeio && pip install -r requirements.pip
Because of the use of '&&', it will only get to the final 'pip install' command if all the previous commands have succeeded.
In fact, since every RUN creates a new commit & (currently) a...