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Hashing a dictionary?
For caching purposes I need to generate a cache key from GET arguments which are present in a dict.
11 Answers
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Add single element to array in numpy
...s a new array which can be the old array with the appended element.
I think it's more normal to use the proper method for adding an element:
a = numpy.append(a, a[0])
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Visual Studio keyboard shortcut to display IntelliSense
What's the keyboard shortcut for Visual Studio 2005 and Visual Studio 2008 to display the IntelliSense box if one accidentally hits ESC and wants the box come back again?
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Map over object preserving keys
...erscore provides a function _.mapObject to map the values and preserve the keys.
_.mapObject({ one: 1, two: 2, three: 3 }, function (v) { return v * 3; });
// => { one: 3, two: 6, three: 9 }
DEMO
With Lodash
Lodash provides a function _.mapValues to map the values and preserve the keys.
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Iterating over dictionaries using 'for' loops
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key is just a variable name.
for key in d:
will simply loop over the keys in the dictionary, rather than the keys and values. To loop over both key and value you can use the following:
For Python 3.x:
for key, value i...
Move an array element from one array position to another
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If you'd like a version on npm, array-move is the closest to this answer, although it's not the same implementation. See its usage section for more details. The previous version of this answer (that modified Array.prototype.move) can be...
Python's json module, converts int dictionary keys to strings
... is run, python's json module (included since 2.6) converts int dictionary keys to strings.
9 Answers
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How to create an array containing 1…N
I'm looking for any alternatives to the below for creating a JavaScript array containing 1 through to N where N is only known at runtime.
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std::next_permutation Implementation Explanation
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Let's look at some permutations:
1 2 3 4
1 2 4 3
1 3 2 4
1 3 4 2
1 4 2 3
1 4 3 2
2 1 3 4
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How do we go from one permutation to the next? Firstly, let's look at things a little differently. We can view the elements as digits and ...
C# Java HashMap equivalent
... HashMap has the put and get methods for setting/getting items
myMap.put(key, value)
MyObject value = myMap.get(key)
C#'s Dictionary uses [] indexing for setting/getting items
myDictionary[key] = value
MyObject value = myDictionary[key]
null keys
Java's HashMap allows null keys
.NET's Dicti...