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'sudo gem install' or 'gem install' and gem locations
...s will make the gems visible to gem list, uninstallable via gem uninstall, etc. without needing sudo access. Runnable scripts installed by gem or bundler can be put into your path by adding
$HOME/.gem/ruby/RUBYVERSION/bin
to your $PATH. gem itself tells you about this if it isn't set when you do ...
What is the Swift equivalent to Objective-C's “@synchronized”?
...) & objc_sync_exit(…) are public headers provided by the iOS/macOS/etc. APIs (looks like they're inside the ….sdk at the path usr/include/objc/objc-sync.h). The easiest way to find out if something is a public API or not is to (in Xcode) type the function name (e.g. objc_sync_enter(); argum...
How do I query if a database schema exists
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How to find duplicates in 2 columns not 1
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great thanks, does the order that you group by matter?
– Andrew
Jan 27 '17 at 20:56
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sh...
How to Reverse Fragment Animations on BackStack?
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@TarikW i'm bit late, but order is important in this, you need to call setCostomAnimations before replace, addToBackStack methods
– MD Husnain Tahir
Oct 7 '16 at 4:30
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Android selector & text color
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In order to make it work on selection in a list view use the following code:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:color="#fff"/>
&...
List comprehension vs. lambda + filter
...terator object, so you'd have to pass your filter method call to list() in order to build the filtered list. So in python 2:
lst_a = range(25) #arbitrary list
lst_b = [num for num in lst_a if num % 2 == 0]
lst_c = filter(lambda num: num % 2 == 0, lst_a)
lists b and c have the same values, and wer...
Is there a better way to do optional function parameters in JavaScript? [duplicate]
...ould refactor to pass an object and merge it with a default object, so the order in which arguments are passed doesn't matter (see the second section of this answer, below).
If, however, you just want something quick, reliable, easy to use and not bulky, try this:
A clean quick fix for any numbe...
Add Variables to Tuple
...confusion between an element in parentheses. Plain parentheses are used in order of operations, so (7) is just 7. But (7,) is a one-element tuple where the element is 7. Likewise, 3 * ( 7+8) = 45, but 3 * (7+8,) = (15, 15, 15) -- does that make sense?
– Daniel
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How to compare versions in Ruby?
...lass_eval {include Comparable} will make all arrays respond to <, >, etc. Or, if you just want to do this to certain arrays: a = [1, 2]; a.extend(Comparable)
– Wayne Conrad
Jan 12 '10 at 19:28
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