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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...
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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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...ependency is (now) documented by Intel as erratum HSD146 (Haswell) and SKL029 (Skylake)
Skylake fixed this for lzcnt and tzcnt.
Cannon Lake (and Ice Lake) fixed this for popcnt.
bsf/bsr have a true output dependency: output unmodified for input=0. (But no way to take advantage of that with intrinsi...
javascript: recursive anonymous function?
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edited Nov 27 '14 at 14:27
answered Oct 7 '10 at 16:46
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How to copy a file to a remote server in Python using SCP or SSH?
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edited Dec 30 '19 at 2:12
Boris
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answered Se...
How to configure Ruby on Rails with no database?
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CharlesL
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answered May 4 '09 at 18:17
typemismatchtypemismatch
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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...
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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Getting all selected checkboxes in an array
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20 Answers
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Show just the current branch in Git
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edited Sep 13 '09 at 23:48
answered Sep 13 '09 at 15:39
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