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What's the difference between Ruby's dup and clone methods?
...not.
class Foo
attr_accessor :bar
end
o = Foo.new
o.freeze
o.dup.bar = 10 # succeeds
o.clone.bar = 10 # raises RuntimeError
The Rubinius implementation for these methods
is often my source for answers to these questions, since it is quite clear, and a fairly compliant Ruby implementation.
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How to convert/parse from String to char in java?
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14 Answers
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How to do a regular expression replace in MySQL?
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13 Answers
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Django URL Redirect
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182
You can try the Class Based View called RedirectView
from django.views.generic.base import Re...
Latex Remove Spaces Between Items in List
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172
It's easier with the enumitem package:
\documentclass{article}
\usepackage{enumitem}
\begin{d...
In Postgresql, force unique on combination of two columns
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CREATE TABLE someTable (
id serial primary key,
col1 int NOT NULL,
col2 int NOT NULL,
unique (col1, col2)
)
autoincrement is not postgresql. You want a serial.
If col1 and col2 make a unique and can't be null then they make a good primary key:
CREATE TABLE someTab...
How to find the lowest common ancestor of two nodes in any binary tree?
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How can I find all matches to a regular expression in Python?
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1 Answer
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How to extract a string using JavaScript Regex?
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91
You need to use the m flag:
multiline; treat beginning and end characters (^ and $) as worki...