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setState vs replaceState in React.js
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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...
How to get a complete list of object's methods and attributes?
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edited Jan 18 '12 at 14:56
Jonathan Drake
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a...
Measuring text height to be drawn on Canvas ( Android )
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edited Nov 13 '17 at 20:27
Alon
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answered Sep 27 '10 at 15:02
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What's your most controversial programming opinion?
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Prepend a level to a pandas MultiIndex
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cs95
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answered Feb 7 '17 at 16:11
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How to Execute a Python File in Notepad ++?
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How do I remove a submodule?
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Since git1.8.3 (April 22d, 2013):
There was no Porcelain way to say "I no longer am inter...
How to install Boost on Ubuntu
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answered Sep 25 '12 at 7:57
Anton GuryanovAnton Guryanov
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What does a double * (splat) operator do
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Ruby 2.0 introduced keyword arguments, and ** acts like *, but for keyword arguments. It returns a Hash with key / value pairs.
For this code:
def foo(a, *b, **c)
[a, b, c]
end
Here's a demo:
> foo 10
=> [10, [], {}]
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How to make input type= file Should accept only pdf and xls
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edited Nov 12 '16 at 1:51
Alexis Wilke
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