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With arrays, why is it the case that a[5] == 5[a]?
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The C standard defines the [] operator as follows:
a[b] == *(a + b)
Therefore a[5] will evaluate to:
*(a + 5)
and 5[a] will evaluate to:
*(5 + a)
a is a pointer to the first element of the array. a[5] is the value that's 5 el...
What's the difference between HEAD^ and HEAD~ in Git?
...n I specify an ancestor commit object in Git, I'm confused between HEAD^ and HEAD~ .
15 Answers
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What is the difference between service, directive and module?
I have been reading a lot of docs, and I'm getting more and more confused.
I basically can't figure out the difference between a
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Why not use always android:configChanges=“keyboardHidden|orientation”?
I was wondering why not use android:configChanges="keyboardHidden|orientation" in every (almost every ;)) activity?
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Can Protractor and Karma be used together?
...://github.com/angular/protractor/issues/9#issuecomment-19927049
Protractor and Karma should not be used together; instead they provide separate systems for running tests. Protractor and Karma cover different aspects of testing - Karma is intended mostly for unit tests, while Protractor should be use...
CUDA incompatible with my gcc version
... with CUDA SDK.
I have installed the developers driver (version 270.41.19) and the CUDA toolkit,
then finally the SDK (both the 4.0.17 version).
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What is the difference between a map and a dictionary?
... values. Isn't a dictionary the same? What is the difference between a map and a dictionary 1 ?
11 Answers
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What is the difference between lock and Mutex?
What is the difference between lock and Mutex? Why can't they be used interchangeably?
7 Answers
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JavaScript: client-side vs. server-side validation
...k to the average user. For example, if they enter an invalid email address and move to the next field, you can show an error message immediately. That way the user can correct every field before they submit the form.
If you only validate on the server, they have to submit the form, get an error mes...
How to combine class and ID in CSS selector?
...* Won't work in IE6, but valid */
div.firstClass.secondClass /* ditto */
and, per your example:
div#content.sectionA
Edit, 4 years later: Since this is super old and people keep finding it: don't use the tagNames in your selectors. #content.myClass is faster than div#content.myClass because the...