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What's the difference between a proc and a lambda in Ruby?

...ept the resulting Proc objects check the number of parameters passed when called. An example: p = Proc.new {|a, b| puts a**2+b**2 } # => #<Proc:0x3c7d28@(irb):1> p.call 1, 2 # => 5 p.call 1 # => NoMethodError: undefined method `**' for nil:NilClass p.call 1, 2, 3 # => 5 l = lamb...
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What does PHP keyword 'var' do?

...tants states that var must not be used, and visibility must be declared on all properties. – Charles Wood Nov 11 '19 at 14:23 ...
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Dynamic Sorting within SQL Stored Procedures

...ed by modern RDBMS solutions but as yet I have not found anything that really addresses what I see to be an incredibly common need in any Web or Windows application with a database back-end. ...
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Gridview with two columns and auto resized images

... Basically, in Android's ImageView class, there's no way to simply specify "hey, keep a square aspect ratio (width / height) for this view" unless you hard code width and height. You could do some manual adjustment of LayoutParams ...
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Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragme

... block, code updated. More edits: Turns out you need that try-catch after all. Just checking for the map fragment turned out not to work so well after all. Blergh. share | improve this answer ...
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Copying files into the application folder at compile time

...ory you want. Here's a post build Macro that I think will work by copying all files in a directory called Configuration to the root build folder: copy $(ProjectDir)Configuration\* $(ProjectDir)$(OutDir) share | ...
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What's the difference between an element and a node in XML?

...M considers nodes more basic (primitive) than elements, when "element" actually refers to the most basic building block in English. – BoltClock♦ Dec 12 '12 at 6:01 16 ...
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How to scale Docker containers in production

... Update: 2019-03-11 First of all thanks for those who have upvoted this answer over the years. Please be aware that this question was asked in August 2013, when Docker was still a very new technology. Since then: Kubernetes was launched on June 2014, Do...
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How do I download a binary file over HTTP?

...time.flv','C:\tmp\secretlylove.flv'). Binaries for wget and curl exist for all operating system via download as well. I still highly recommend using the standard library unless your writing code solely for your own lovin'. – fny Jan 23 '13 at 12:51 ...
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How to convert String to long in Java?

...g value. If a new Long instance is not required, this method should generally be used in preference to the constructor Long(long), as this method is likely to yield significantly better space and time performance by caching frequently requested values. Note that unlike the corresponding me...