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What is the best way to convert an array to a hash in Ruby
...y keys or values!
Building on @John Topley's popular answer, let's try:
a3 = [ ['apple', 1], ['banana', 2], [['orange','seedless'], 3] ]
h3 = Hash[*a3.flatten]
This throws an error:
ArgumentError: odd number of arguments for Hash
from (irb):10:in `[]'
from (irb):10
The constru...
When is SQLiteOpenHelper onCreate() / onUpgrade() run?
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359
SQLiteOpenHelper onCreate() and onUpgrade() callbacks are invoked when the database is actuall...
Fastest hash for non-cryptographic uses?
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13 Answers
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Matrix Transpose in Python
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310
Python 2:
>>> theArray = [['a','b','c'],['d','e','f'],['g','h','i']]
>>> zi...
Find a file in python
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edited Nov 12 '09 at 19:33
answered Nov 12 '09 at 19:25
N...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
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3446
With new_list = my_list, you don't actually have two lists. The assignment just copies the re...
How do I save and restore multiple variables in python?
... here...
# Saving the objects:
with open('objs.pkl', 'w') as f: # Python 3: open(..., 'wb')
pickle.dump([obj0, obj1, obj2], f)
# Getting back the objects:
with open('objs.pkl') as f: # Python 3: open(..., 'rb')
obj0, obj1, obj2 = pickle.load(f)
If you have a lot of data, you can reduce...
Collisions when generating UUIDs in JavaScript?
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35
My best guess is that Math.random() is broken on your system for some reason (bizarre as that s...
Simple basic explanation of a Distributed Hash Table (DHT)
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3 Answers
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Error while installing json gem 'mkmf.rb can't find header files for ruby'
...ll ruby2.0-dev
sudo apt-get install ruby2.2-dev
sudo apt-get install ruby2.3-dev
or, generic way:
sudo apt-get install ruby-dev
or
sudo apt-get install ruby`ruby -e 'puts RUBY_VERSION[/\d+\.\d+/]'`-dev
The first link you’ve posted is exactly your case: there is no ruby development...