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How to create an array from a CSV file using PHP and the fgetcsv function
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edited May 23 '14 at 7:23
Jaak Kütt
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How to round a number to significant figures in Python
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20 Answers
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How to remove an element from an array in Swift
....g:
var animals = ["cats", "dogs", "chimps", "moose"]
animals.remove(at: 2) //["cats", "dogs", "moose"]
A non-mutating alternative that will keep the original collection unchanged is to use filter to create a new collection without the elements you want removed, e.g:
let pets = animals.filter ...
Best practices for SQL varchar column length [closed]
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244
No DBMS I know of has any "optimization" that will make a VARCHAR with a 2^n length perform be...
How to return an empty ActiveRecord relation?
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edited Nov 9 '16 at 2:25
Patrick Brinich-Langlois
1,2301414 silver badges2626 bronze badges
answer...
How do you round a floating point number in Perl?
...ntf() or printf() is usually the easiest
route.
printf("%.3f", 3.1415926535); # prints 3.142
The POSIX module (part of the standard Perl distribution) implements
ceil(), floor(), and a number of other mathematical and trigonometric
functions.
use POSIX;
$ceil = ceil(3.5); ...
How to show line number when executing bash script
...or example, if your script reads:
$ cat script
foo=10
echo ${foo}
echo $((2 + 2))
Executing it thus would print line numbers:
$ PS4='Line ${LINENO}: ' bash -x script
Line 1: foo=10
Line 2: echo 10
10
Line 3: echo 4
4
http://wiki.bash-hackers.org/scripting/debuggingtips gives the ultimate PS4 t...
How do I find the caller of a method using stacktrace or reflection?
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12 Answers
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Convert data.frame column to a vector?
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211
I'm going to attempt to explain this without making any mistakes, but I'm betting this will at...