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What is this 'Lambda' everyone keeps speaking of?
...re a variable. In JavaScript:
function () {}; // very simple
Let's see now some uses for these lambdas.
Abstracting boilerplate code
Lambdas may be used to abstract away boilerplate code. For example loops. We're used to write for and while loops all day long. But this is code that does not be...
Is there a literal notation for an array of symbols?
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Yes! This is possible now in Ruby 2.0.0. One way to write it is:
%i{foo bar} # => [:foo, :bar]
You can also use other delimiters, so you could also write %i(foo bar) or %i!foo bar! for example.
This feature was originally announced here:
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When should we use Observer and Observable?
...n its state which you would want to broadcast to the rest of the program.
Now, to do this we have to call some kind of method. We don't want the Observable class to be tightly coupled with the classes that are interested in observing it. It doesn't care who it is as long as it fulfils certain crite...
Ajax using https on an http page
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Seems like Opera supports it now: en.wikipedia.org/wiki/… Only not Opera Mini though...
– gitaarik
Mar 5 '14 at 11:07
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Removing list of vms in vagrant cache
...ne is correct to not be aware of deleted Vagrant directories as Vagrant's knowledge of the VM it managed in that directory was removed when its files managing the VM were. It's the hypervisor's problem now.
– bschlueter
Aug 9 '16 at 20:25
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unsigned int vs. size_t
..."your compiler might make assumption about it": I would hope the compiler knows the exact range of values that size_t can represent! If it doesn't, who does?
– Marc van Leeuwen
Jun 15 '14 at 5:42
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Understanding Python's “is” operator
... actually wrong! Thanks for pointing that out @martijn-pieters ! I should know by now never to post code without testing it! >>> x=1.0; y=1.0 >>> x is y True >>> x=1.0 >>> y=1.0 >>> x is y False
– Magnus Lyckå
Sep ...
How to extract the decision rules from scikit-learn decision-tree?
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@Daniele, do you know how the classes are ordered? I would guess alphanumeric, but I haven't found confirmation anywhere.
– IanS
Sep 4 '15 at 8:27
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git: How to diff changed files versus previous versions after a pull?
When I run "git pull" I often want to know what changed between the last version of a file and the new one. Say I want to know what someone else committed to a particular file.
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GOTO still considered harmful? [closed]
... to invoke one or the other. The concept was simply "choose what to invoke now" rather than "go here or go there". Again, just a change of metaphor.
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