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How do I create a variable number of variables?
... assign to the var
print(variable_name) # >>> 15, created from a string
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XPath to select element based on childs child value
...try it! Generally you want single quotes ' rather than double quotes " for string literals in xpath, by the way.
– AakashM
Oct 22 '18 at 12:25
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If list index exists, do X
In my program, user inputs number n , and then inputs n number of strings, which get stored in a list.
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ValueError : I/O operation on closed file
Here, p is a dictionary, w and c both are strings.
2 Answers
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How to perform Unwind segue programmatically?
...nsert Name of Segue to unwind.
Then,- (void)performSegueWithIdentifier:(NSString *)identifier sender:(id)sender. with your segue identify.
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Retrieving a List from a java.util.stream.Stream in Java 8
... you can use to convert any Stream to List.
more concretely:
List<String> myList = stream.collect(Collectors.toList());
from:
https://www.geeksforgeeks.org/collectors-tolist-method-in-java-with-examples/
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How to check that an object is empty in PHP?
...($obj), TRUE)` can be slow because
// you're converting to and from a JSON string.
// I don't know another simple way to do a deep conversion from object to array
$array = json_decode(json_encode($obj), TRUE);
if ( !array_filter($array) )
{
// empty or all properties falsey
}
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How to swap two variables in JavaScript
...t; the values are auto-cast to int32s. This means it can work with numeric strings, Booleans (0/1), null (0), and empty arrays/objects (0). Though the original type isn't preserved, so affected Booleans wouldn't work with typeof a == 'boolean' or a === false, for example. Real numbers work, except t...
Java time-based map/cache with expiring keys [closed]
...sing the == semantics, not equals(). I lost 30 minutes figuring out why my String-keyed cache was not working :)
– Laurent Grégoire
Nov 21 '13 at 10:45
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How to do what head, tail, more, less, sed do in Powershell? [closed]
... typed structure, eg. dates remain DateTime instances – rather than just strings, which each command needs to parse itself, much of sed and other such programs are redundant.
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