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Swift variable decorations with “?” (question mark) and “!” (exclamation mark)
...= 2
// The type here is "Implicitly Unwrapped Optional Int"
var z: Int! = 3
Usage:
// you can add x and z
x + z == 4
// ...but not x and y, because y needs to be unwrapped
x + y // error
// to add x and y you need to do:
x + y!
// but you *should* do this:
if let y_val = y {
x + y_val
}
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When do you need to explicitly call a superclass constructor?
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How to set a stroke-width:1 on only certain sides of SVG shapes?
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How to print to console in pytest?
...est-2.5.2
plugins: cache, cov, pep8, xdist
collected 2 items
tmp.py 0
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.this should fail!
F
=================================== FAILURES ===================================
___________________________________ test_bad ___________________________________
def ...
Remote branch is not showing up in “git branch -r”
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3
This fixed my ongoing branching issue in Git that I had for weeks. Suddenly all the git remote update stuff actually started working. Thanks...
How to get a URL parameter in Express?
...sue on getting the value of tagid from my URL: localhost:8888/p?tagid=1234 .
4 Answers
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How to make an app's background image repeat
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430
Ok, here's what I've got in my app. It includes a hack to prevent ListViews from going black wh...
Error: Jump to case label
... the { }
dostuff(i);
break;
}
case 2:
dostuff(123); // Now you cannot use i accidentally
}
Edit
To further elaborate, switch statements are just a particularly fancy kind of a goto. Here's an analoguous piece of code exhibiting the same issue but using a goto instead of...
Is there a way to follow redirects with command line cURL?
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