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What does the “map” method do in Ruby?
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The map method takes an enumerable object and a block, and runs the block for each element, outputting each returned value from the block (the original object is unchanged unless you use map!):
[1, 2, 3].map { |n| n * n } #=> [1, 4, 9]
Array and Range are enume...
postgresql list and order tables by size
How can I list all the tables of a PostgreSQL database and order them by size ?
7 Answers
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Frame Buster Buster … buster code needed
...create a div element that covers the whole page (modal box) with a message and a link like...
You are viewing this page in a unauthorized frame window - (Blah blah... potential security issue)
click this link to fix this problem
Not the best, but I don't see any way they could script their way out...
How can I get dict from sqlite query?
...ter this example in the docs:
If returning a tuple doesn’t suffice
and you want name-based access to
columns, you should consider setting
row_factory to the highly-optimized
sqlite3.Row type. Row provides both
index-based and case-insensitive
name-based access to columns with
alm...
Maven error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher
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I hit this problem too, and found this article. For Maven3, changing my environment variable name from M2_HOME to M3_HOME did the trick. I am on a Mac running OSX 10.9 with JDK 1.7. Hope this helps.
Note: Please delete M2_HOME, if already set. E...
jquery input select all on focus
I'm using this code to try and select all of the text in the field when a user focuses on the field. What happens is, it selects all for a second, then its unselected and the typing cursor is left where I clicked...
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Inspect hovered element in Chrome?
...r tooltip will appear. Without leaving the element, open a new window (Command-N on Mac, Ctrl-N elsewhere) - Step 3: Drag the new window below the old window, so you can still see the tooltip, then move your cursor into the Element inspector. - Step 4: Scroll to the bottom, where your tooltip is app...
How to prevent UINavigationBar from covering top of view in iOS 7?
...screenshots, the first showing everything in the view as it's pulled down, and the second showing all of it untouched. The search bar should begin where the navigation bar.
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How to convert string to char array in C++?
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Yes, I think that's a reasonable way to handle it.
– Fred Larson
Nov 8 '12 at 17:17
1
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Is JavaScript guaranteed to be single-threaded?
...aded in all modern browser implementations, but is that specified in any standard or is it just by tradition? Is it totally safe to assume that JavaScript is always single-threaded?
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