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What does @@variable mean in Ruby?
What are Ruby variables preceded with double at signs ( @@ )? My understanding of a variable preceded with an at sign is that it is an instance variable, like this in PHP:
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bash assign default value
...=${LONG_VARIABLE_NAME:-hello} , but now bash also tries to execute 'hello' and that gives a command not found. Any way to avoid that? Or will I have to stick to the latter? Can someone give an example where the assign default is actually useful?
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Can I have H2 autocreate a schema in an in-memory database?
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Note that if you use H2 with hibernate and want to run multiple scripts by calling RUNSCRIPT, you should type triple backslash (\\\). For example, you should set up <property name="hibernate.connection.url">jdbc:h2:mem:test;INIT=RUNSCRIPT FROM 'script1.sql'\...
jQuery document.createElement equivalent?
I'm refactoring some old JavaScript code and there's a lot of DOM manipulation going on.
14 Answers
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What is the easiest way to remove the first character from a string?
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p asdf
# >> "12,23,987,43"
I'm always looking for the fastest and most readable way of doing things:
require 'benchmark'
N = 1_000_000
puts RUBY_VERSION
STR = "[12,23,987,43"
Benchmark.bm(7) do |b|
b.report('[0]') { N.times { "[12,23,987,43"[0] = '' } }
b.report('sub') { N.time...
What is “function*” in JavaScript?
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It's a Generator function.
Generators are functions which can be exited and later re-entered. Their context (variable bindings) will be saved across re-entrances.
Calling a generator function does not execute its body immediately; an iterator object for the function is returned instead. When the ...
UML class diagram enum
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| Tuesday |
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|_____________________|
And then just have an association between that and your class.
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How to copy files between two nodes using ansible
...ate_to: serverB cannot be used, because that would make serverB the source and destination.
– Strahinja Kustudic
Apr 19 '16 at 22:10
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How to revert a merge commit that's already pushed to remote branch?
git revert <commit_hash> alone won't work. -m must be specified, and I'm pretty confused about it.
16 Answers
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MySQL Select all columns from one table and some from another table
How do you select all the columns from one table and just some columns from another table using JOIN? In MySQL.
4 Answers
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