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How do I revert a Git repository to a previous commit?
...ch were
# changed since the commit you reset to.
If you mess up, you've already thrown away your local changes, but you can at least get back to where you were before by resetting again.
Undo published commits with new commits
On the other hand, if you've published the work, you probably don't want...
Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail
...lt;/script>
This should be in your page's <head> and any jQuery ready event handlers should be in the <body> to avoid errors (although it's not fool-proof!).
One more reason to not use Google-hosted jQuery is that in some countries, Google's domain name is banned.
...
Split string every nth character?
...
There is already an inbuilt function in python for this.
>>> from textwrap import wrap
>>> s = '1234567890'
>>> wrap(s, 2)
['12', '34', '56', '78', '90']
This is what the docstring for wrap says:
>>&...
What does @@variable mean in Ruby?
...tricky subject to wrap your mind around, and there is plenty of additional reading on the subject, but think about it as modifying the Class class, but only the instance of the Class class you're working with. An example:
class Polygon
class << self
attr_accessor :sides
end
end
class...
Is Safari on iOS 6 caching $.ajax results?
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This works for me, but I don't understand how. I had already specified cache: false in my ajaxSetup, and looking at the request headers, that boils down to Cache-Control: no-cache and Pragma: no-cache - but it will still cache on the iPad. Then when I add headers: { "cache-contro...
MySQL - UPDATE multiple rows with different values in one query
... how I can do so that the update is executed, if the record already exists
– franvergara66
Sep 7 '14 at 2:21
1
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performSelector may cause a leak because its selector is unknown
...void *)imp;
func(_controller, selector);
Or more tersely (though hard to read & without the guard):
SEL selector = NSSelectorFromString(@"someMethod");
((void (*)(id, SEL))[_controller methodForSelector:selector])(_controller, selector);
Explanation
What's going on here is you're asking th...
Assigning code to a variable
...see how they could be useful in your situation:
There are many delegates already defined by .NET libraries, with some like Action, which do not accept any parameter and does no return a value. It is defined as public delegate void Action();
You can always use it to your needs instead of the need of ...
What is meant by immutable?
...ual mutables private state (and therefore can't be shared safely between threads).
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How are Python's Built In Dictionaries Implemented?
...ect.c:337,344-345) respectively. If both match, then it thinks the entry already exists, gives up and moves on to the next entry to be inserted. If either hash or the key don't match, it starts probing.
Probing just means it searches the slots by slot to find an empty slot. Technically we could jus...