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Way to go from recursion to iteration
...
345
Usually, I replace a recursive algorithm by an iterative algorithm by pushing the parameters th...
Behaviour of increment and decrement operators in Python
... default.
– newacct
Sep 28 '09 at 7:47
45
Also, be aware that, in Python, += and friends are not ...
Why does sizeof(x++) not increment x?
...
542
From the C99 Standard (the emphasis is mine)
6.5.3.4/2
The sizeof operator yields the ...
Javascript reduce on array of objects
... the sum of the x properties of the parameters:
var arr = [{x:1},{x:2},{x:4}];
arr.reduce(function (a, b) {
return {x: a.x + b.x}; // returns object with property x
})
// ES6
arr.reduce((a, b) => ({x: a.x + b.x}));
// -> {x: 7}
Explanation added from comments:
The return value of each...
Best implementation for hashCode method for a collection
...
442
The best implementation? That is a hard question because it depends on the usage pattern.
A f...
Pick a random element from an array
...
Swift 4.2 and above
The new recommended approach is a built-in method on the Collection protocol: randomElement(). It returns an optional to avoid the empty case I assumed against previously.
let array = ["Frodo", "Sam", "Wise", ...
C# vs Java Enum (for those new to C#)
...public static readonly Planet MERCURY = new Planet("Mercury", 3.303e+23, 2.4397e6);
public static readonly Planet VENUS = new Planet("Venus", 4.869e+24, 6.0518e6);
public static readonly Planet EARTH = new Planet("Earth", 5.976e+24, 6.37814e6);
public static readonly Plan...
C++ convert hex string to signed integer
...
Robert Harvey
164k4141 gold badges308308 silver badges467467 bronze badges
answered Jul 1 '09 at 17:56
Evan TeranEvan...
How do I convert a pandas Series or index to a Numpy array? [duplicate]
...se the values attribute:
In [1]: df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]}, index=['a', 'b', 'c']); df
A B
a 1 4
b 2 5
c 3 6
In [2]: df.index.values
Out[2]: array(['a', 'b', 'c'], dtype=object)
This accesses how the data is already stored, so there's no need for a conversion.
...
What's the purpose of git-mv?
...
408
git mv oldname newname
is just shorthand for:
mv oldname newname
git add newname
git rm old...