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What is hashCode used for? Is it unique?
...ingerprint. We can use this finger print to identify people of interest.
Read below for more details:
Think of a Hashcode as us trying to To Uniquely Identify Someone
I am a detective, on the look out for a criminal. Let us call him Mr Cruel. (He was a notorious murderer when I was a kid -- he b...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...ence', 1)
INSERT INTO post_comment (post_id, review, id)
VALUES (2, 'Must-read for Java developers', 2)
INSERT INTO post_comment (post_id, review, id)
VALUES (3, 'Five Stars', 3)
INSERT INTO post_comment (post_id, review, id)
VALUES (4, 'A great reference book', 4)
N+1 query problem with plain ...
git revert back to certain commit [duplicate]
...at the user has a remote repository that they are tracking and that they already pushed their bad commits to it.
– Andy
Jul 7 '16 at 21:13
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How to go back (ctrl+z) in vi/vim
... use the u button to undo the last modification. (And Ctrl+R to redo it).
Read more about it at: http://vim.wikia.com/wiki/Undo_and_Redo
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What's the difference between RSpec and Cucumber? [closed]
...not find.
The main difference between RSpec and Cucumber are the business readability factor. Cucumber's main draw is that the specification (features) are separate from the test code, so your product owners can provide or review the specification without having to dig through code. These are the ....
How can I check if a key exists in a dictionary? [duplicate]
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Interesting, I remember that I read somewhere in the official docs that it is better to ask for forgiveness than permission...
– Yannic Hamann
Jan 15 at 6:36
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Why is require_once so bad to use?
Everything I read about better PHP coding practices keeps saying don't use require_once because of speed.
14 Answers
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Abusing the algebra of algebraic data types - why does this work?
...nked to a paper about that in my answer but I could swear I remember first reading about it on your blog.
– C. A. McCann
Feb 8 '12 at 20:00
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Various ways to remove local Git changes
...It all depends on exactly what you are trying to undo/revert. Start out by reading the post in Ube's link. But to attempt an answer:
Hard reset
git reset --hard [HEAD]
completely remove all staged and unstaged changes to tracked files.
I find myself often using hard resetting, when I'm like "ju...
How to check if a file exists from inside a batch file [duplicate]
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The IF command is quite powerful. The output of IF /? will reward careful reading. For that matter, try the /? option on many of the other built-in commands for lots of hidden gems.
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