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How do you know when to use fold-left and when to use fold-right?
...re, you use a left fold. Example (haskell-style pseudocode)
foldl (-) [1, 2, 3] == (1 - 2) - 3 == 1 - 2 - 3 // - is left-associative
If your operator is right-associative (right fold), the parentheses would be set like this:
A x (B x (C x D))
Example: Cons-Operator
foldr (:) [] [1, 2, 3] == 1...
Which characters are illegal within a branch name?
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What is the difference between ~> and >= when specifying rubygem in Gemfile?
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how to get the current working directory's absolute path from irb
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521
Dir.pwd seems to do the trick.
http://ruby-doc.org/core/Dir.html#method-c-pwd
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Chmod recursively
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edited Nov 14 '12 at 11:30
answered Nov 14 '12 at 11:23
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I want to copy table contained from one database and insert onto another database table
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If you want to copy a table from one Database to another database , You can simply do as below...
Loop through Map in Groovy?
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Quite simple with a closure:
def map = [
'iPhone':'iWebOS',
'Android':'2....
python assert with and without parenthesis
...s optional, you've essentially called assert True when you wrote assert(1==2, "hi").
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