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How can I use Async with ForEach?
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This has the advantage that on top of awaiting each element, you are now also awaiting the MoveNext of the enumerator. This is important in cases where the enumerator cannot fetch the next element instantly, and must wait for one to become available.
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Can regular expressions be used to match nested patterns? [duplicate]
...-down automaton, i.e a parser for a context-free grammar, for instance LL (top-down) or LR (bottom-up). You have to take the worse runtime behavior into account: O(n^3) vs. O(n), with n = length(input).
There are many parser generators avialable, for instance ANTLR for Java. Finding an existing gra...
How to make a programme continue to run after log out from ssh? [duplicate]
... you have a program running in the foreground, press ctrl-Z, then:
[1]+ Stopped myprogram
$ disown -h %1
$ bg 1
[1]+ myprogram &
$ logout
If there is only one job, then you don't need to specify the job number. Just use disown -h and bg.
Explanation of the above steps:
You ...
Set padding for UITextField with UITextBorderStyleNone
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I created this category implementation and added it to the top of the .m file.
@implementation UITextField (custom)
- (CGRect)textRectForBounds:(CGRect)bounds {
return CGRectMake(bounds.origin.x + 10, bounds.origin.y + 8,
bounds.size.width - 20...
AWS MySQL RDS vs AWS DynamoDB [closed]
...using DynamoDB for specific tasks may make sense, building a new system on top of DynamoDB is really a bad idea. Best laid plans etc., you always need that extra flexibility from your DB.
Here are our reasons we moved from DynamoDB:
Indexing - Changing or adding keys on-the-fly is impossible wi...
Eclipse syntax highlighting preferences save and restore
...tadata.plugins\org.eclipse.core.runtime.settings\
Copy and paste over the top of the one in your new eclipse instance. This worked for me when moving from 3.4 to 3.5
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Finding duplicate values in MySQL
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Extremely helpful answer, this should be top so more people see it. I remember how much pain I went through creating such lists, and it was available all the time as command ..
– John
May 23 '18 at 15:45
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CSS: Change image src on img:hover
...com/w3images/fjords.jpg);
}
.img-wrapper > img {
vertical-align: top;
}
.img-wrapper > img:hover {
opacity: 0;
}
<div class="img-wrapper">
<img src="https://www.w3schools.com/w3css/img_lights.jpg" alt="image" />
</div>
This is a CSS only solution wi...
Can an abstract class have a constructor?
... the constructors in the corresponding inheritance tree are invoked in the top to bottom approach. The same case applies to abstract classes. Though we cannot create an object of an abstract class, when we create an object of a class which is concrete and subclass of the abstract class, the construc...
How to remove all whitespace from a string?
...ions (though as of Dec 2014, the development version has a branch built on top of stringi, mentioned below). The equivalents of the above commands, using [str_replace_all][3], are:
library(stringr)
str_replace_all(x, fixed(" "), "")
str_replace_all(x, space(), "")
stringr also has a str_trim fun...