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Validate that a string is a positive integer
...hose in a non-standard (but formerly-allowed) way that says a leading zero means octal (base 8), e.g "010" => 8. Once you've validated the number, you can safely use parseInt(str, 10) to ensure that it's parsed as decimal (base 10). parseInt would ignore garbage at the end of the string, but we'v...
How to debug Google Apps Script (aka where does Logger.log log to?)
...d the event argument is not available in the Script Editor, it effectively means that the developers of these types of scripts have no real-time way of accessing the logs.
– Jeff
Feb 12 '14 at 15:32
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Looping over arrays, printing both index and value
... i in "${!foo[@]}"; do
printf "%s\t%s\n" "$i" "${foo[$i]}"
done
Which means that indices will be in $i while the elements themselves have to be accessed via ${foo[$i]}
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Bare asterisk in function arguments?
...g positional arguments, they could reach the following named arguments). * means the same "positional arguments can't go beyond here", but the lack of a name means "but I won't accept them at all, because I chose not to provide a place to put them".
– ShadowRanger
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Working with select using AngularJS's ng-options
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This is not how it is meant to be used. ng-model should point to another variable on your scope, not related with make. See the example in docs.angularjs.org/api/ng/directive/ngOptions
– Dmitri Zaitsev
Apr 24...
What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?
...sive and non-recursive versions of the various mapping commands. What that means is that if you do:
:map j gg
:map Q j
:noremap W j
j will be mapped to gg. Q will also be mapped to gg, because j will be expanded for the recursive mapping. W will be mapped to j (and not to gg) because j will not b...
extract part of a string using bash/cut/split
...${MYVAR%%pattern} # delete longest match of pattern from the end
So # means match from the beginning (think of a comment line) and % means from the end. One instance means shortest and two instances means longest.
You can get substrings based on position using numbers:
${MYVAR:3} # Remove t...
Is there a unique Android device ID?
...e it can be 'null', we can check for 'null' and change its value, but this means it will no longer be unique.
If you have a user with a factory reset device, the value may have changed or altered on the rooted device so there may be duplicates entries if you are tracking user installs.
WLAN MAC Add...
Remove Last Comma from a string
...beginning and end of the regular expression
The , matches the comma
The \s means whitespace characters (space, tab, etc) and the * means 0 or more
The $ at the end signifies the end of the string
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Difference between “on-heap” and “off-heap”
... 'Full GC'. A full GC involves scanning the complete allocated Heap, which means GC pauses/slowdowns are proportional to an applications heap size. So don't trust any person telling you 'Memory is Cheap'. In java memory consumtion hurts performance. Additionally you may get notable pauses using heap...