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Ruby class instance variable vs. class variable
..., :doll]
#=> [:car, :doll]
#=> [:car, :doll]
#=> [:car, :doll]
With an instance variable on a class (not on an instance of that class) you can store something common to that class without having sub-classes automatically also get them (and vice-versa). With class variables, you have the c...
Can you provide some examples of why it is hard to parse XML and HTML with a regex? [closed]
... see people making over and over again is trying to parse XML or HTML with a regex. Here are a few of the reasons parsing XML and HTML is hard:
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100% Min Height CSS layout
In particular if you have a layout with a header and footer of fixed height ,
13 Answers
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What do the makefile symbols $@ and $< mean?
...$@ is the name of the target being generated, and $< the first prerequisite (usually a source file). You can find a list of all these special variables in the GNU Make manual.
For example, consider the following declaration:
all: library.cpp main.cpp
In this case:
$@ evaluates to all
$< eval...
rake db:schema:load vs. migrations
... be made to the database during deploys: migrations provide this functionality with a rollback failsafe. If you run rake db:schema:load on a production server, you'll end up deleting all your production data. This is a dangerous habit to get into.
That being said, I believe it is a decent practice ...
What is two way binding?
...sn't have a "baked-in" implementation of #2 (although you can certainly do it using event listeners). Other frameworks like Knockout do wire up two-way binding automagically.
In Backbone, you can easily achieve #1 by binding a view's "render" method to its model's "change" event. To achieve #2...
Copy folder recursively, excluding some folders
I am trying to write a simple bash script that will copy the entire contents of a folder including hidden files and folders into another folder, but I want to exclude certain specific folders. How could I achieve this?
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Remove insignificant trailing zeros from a number?
...
If you convert it to a string it will not display any trailing zeros, which aren't stored in the variable in the first place since it was created as a Number, not a String.
var n = 1.245000
var noZeroes = n.toString() // "1.245"
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Find a pair of elements from an array whose sum equals a given number
...ive sum
for i=0 to arr.length - 1 do
# key is the element and value is its index.
hash(arr[i]) = i
end-for
for i=0 to arr.length - 1 do
# if K-th element exists and it's different then we found a pair
if hash(K - arr[i]) != i
print "pair i , hash(K - arr[i]) has sum K"
end-if
en...
How to “git show” a merge commit with combined diff output even when every changed file agrees with
After doing a "simple" merge (one without conflicts), git show usually only shows something like
11 Answers
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