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Group a list of objects by an attribute : Java
...ew HashMap<Integer, List<Student>>();
Iterate over this code and add students to the HashMap:
if (!hashMap.containsKey(locationId)) {
List<Student> list = new ArrayList<Student>();
list.add(student);
hashMap.put(locationId, list);
} else {
hashMap.get(loca...
How to scroll to specific item using jQuery?
... element.scrollIntoView() - that is all that is required. Animation is standardised. See developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView
– WickyNilliams
Feb 26 '16 at 11:46
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Compare integer in bash, unary operator expected
...at variable substitutions are done, the shell proceeds with the comparison and.... fails because it cannot see anything intelligible to the left of -gt. However, quoting $i:
if [ "$i" -ge 2 ] ; then ...
becomes:
if [ " " -ge 2 ] ; then ...
The shell now sees the double-quotes, and knows th...
Literal notation for Dictionary in C#?
I currently have a WebSocket between JavaScript and a server programmed in C#. In JavaScript, I can pass data easily using an associative array:
...
Why doesn't delete set the pointer to NULL?
...tomatic setting of the pointer to NULL after delete is not part of the standard. If this gets taken care of then many of the crashes due to an invalid pointer would not occur. But having said that I can think of couple of reasons why the standard would have restricted this:
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start MySQL server from command line on Mac OS Lion
...led in System Preference, I want to know the instruction to start from command-line.
I do as follow:
13 Answers
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Where am I? - Get country
An android mobile actually does know quite well where it is - but is there a way of retrieving the country by something like a country code?
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How to check if a file is empty in Bash?
... help you.
Notice incidentally that I have swapped the roles of empty.txt and full.txt, as @Matthias suggests.
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cocktail party algorithm SVD implementation … in one line of code?
... a slide within the introductory lecture on machine learning by Stanford's Andrew Ng at Coursera, he gives the following one line Octave solution to the cocktail party problem given the audio sources are recorded by two spatially separated microphones:
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Reference list item by index within Django template?
This may be simple, but I looked around and couldn't find an answer. What's the best way to reference a single item in a list from a Django template?
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