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setState vs replaceState in React.js
...t case.
If your current state is {a: 1}, and you call this.setState({b: 2}); when the state is applied, it will be {a: 1, b: 2}. If you called this.replaceState({b: 2}) your state would be {b: 2}.
Side note: State isn't set instantly, so don't do this.setState({b: 1}); console.log(this.state) w...
select and update database record with a single queryset
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Use the queryset object update method:
MyModel.objects.filter(pk=some_value).update(field1='so...
What's the difference between integer class and numeric class in R
...e are multiple classes that are grouped together as "numeric" classes, the 2 most common of which are double (for double precision floating point numbers) and integer. R will automatically convert between the numeric classes when needed, so for the most part it does not matter to the casual user wh...
How to access a preexisting collection with Mongoose?
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Mongoose added the ability to specify the collection name under the schema, or as the third ar...
How to immediately see compile errors in project tree of IntelliJ Idea?
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As of IntelliJ 12 there's an option to automatically build your project upon source changes. In "Settings" --> Build, Execution, Deployment --> "Compiler" check the checkbox "Build project automatically". This will immediately show any...
How can I access “static” class variables within class methods in Python?
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edited Dec 2 '12 at 7:34
Pavel Strakhov
34.1k44 gold badges6969 silver badges111111 bronze badges
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figure of imshow() is too small
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If you don't give an aspect argument to imshow, it will use the value for image.aspect in your m...
do..end vs curly braces for blocks in Ruby
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The general convention is to use do..end for multi-line blocks and curly braces for single lin...
Ruby Metaprogramming: dynamic instance variable names
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edited Feb 6 '13 at 4:22
amacy
28066 silver badges1414 bronze badges
answered Jul 19 '11 at 2:21
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