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Swift variable decorations with “?” (question mark) and “!” (exclamation mark)
I understand that in Swift all variables must be set with a value, and that by using optionals we can set a variable to be set to nil initially.
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Frequency table for a single variable
... and straightforward, but I thought I'd add my own input to this question. If you look at the code for pandas.value_counts, you'll see that there is a lot going on.
If you need to calculate the frequency of many series, this could take a while. A faster implementation would be to use numpy.unique w...
Reactjs: Unexpected token '
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if you have .babelrc file in the project just "presets": ["env", "react", "es2015"] and that's it!!
– Byron Lopez
May 29 '17 at 17:28
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Xcode Command /usr/bin/codesign failed with exit code 1 : errSecInternalComponent
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different case, but similar error message - restart worked.
– mikus
Jul 9 '18 at 13:40
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Clicking the text to select corresponding radio button
...ms to be a little unclickable space between the radio button and the label if done according to Nathan's answer. Here is how to make them join seamlessly (see this article):
<form>
<p>What is my middle name?</p>
<br>
<label><input id="349" type="radio" v...
Viewing full version tree in git
...tell gitk what to display using anything that git rev-list understands, so if you just want a few branches, you can do:
gitk master origin/master origin/experiment
... or more exotic things like:
gitk --simplify-by-decoration --all
...
AngularJS: ng-repeat list is not updated when a model element is spliced from the model array
...ornshøj-Schierbeck I agree, otherwise Angular will not be aware of errors if those occur.
– Jim Aho
Apr 15 '15 at 11:22
2
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Scala @ operator
...
o match {
case Some(x) => println(x)
case None =>
}
But what if you wanted not the content of Some, but the option itself? That would be accomplished with this:
o match {
case x @ Some(_) => println(x)
case None =>
}
Note that @ can be used at any level, not just at the to...
Get UIScrollView to scroll to the top
...RIGINAL
[self.scrollView setContentOffset:CGPointZero animated:YES];
or if you want to preserve the horizontal scroll position and just reset the vertical position:
[self.scrollView setContentOffset:CGPointMake(self.scrollView.contentOffset.x, 0)
animated:YES];
...
Why doesn't println! work in Rust unit tests?
...t test ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured
If tests fail, however, their stdout will be printed regardless if this option is present or not.
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