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What is “callback hell” and how and why does RX solve it?
...itional synchronous style so you end up with nested callbacks everywhere.
4) Or can "callback hell" occur also in a single threaded application?
Asynchronous programming has to do with concurrency while a single-thread has to do with parallelism. The two concepts are actually not the same thing.
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How to source virtualenv activate in a Bash script
... richoricho
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Empty arrays seem to equal true and false at the same time
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d_ethier
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answered Mar 30 '11 at 20:10
wildcardwildcard
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HashSet vs LinkedHashSet
What is the difference between them? I know that
10 Answers
10
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How can I declare and use Boolean variables in a shell script?
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Revised Answer (Feb 12, 2014)
the_world_is_flat=true
# ...do something interesting...
if [ "$the_world_is_flat" = true ] ; then
echo 'Be careful not to fall off!'
fi
Original Answer
Caveats: https://stackoverflow.com/a/21210966/89391
the_wor...
Using semicolon (;) vs plus (+) with exec in find
Why is there a difference in output between using
6 Answers
6
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How to save a list as numpy array in python?
...ctly create an array from a list as:
import numpy as np
a = np.array( [2,3,4] )
Or from a from a nested list in the same way:
import numpy as np
a = np.array( [[2,3,4], [3,4,5]] )
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Dynamic LINQ OrderBy on IEnumerable / IQueryable
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answered Oct 24 '08 at 13:21
Marc Gravell♦Marc Gravell
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Restricting input to textbox: allowing only numbers and decimal point
...arCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode != 46 && charCode > 31
&& (charCode < 48 || charCode > 57))
return false;
return true;
}
//-->
</SCRIPT>
</HEAD>
<BOD...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
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408
9.5 and newer:
PostgreSQL 9.5 and newer support INSERT ... ON CONFLICT (key) DO UPDATE (and ON...