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Simple explanation of MapReduce?
...hem back in the same kind of list.
suppose I have a list of numbers: [1,2,3] and I want to double every number, in this case, the function to "double every number" is function x = x * 2. And without mappings, I could write a simple loop, say
A = [1, 2, 3]
foreach (item in A) A[item] = A[item] * 2
...
Removing duplicates in lists
...ample should cover whatever you are trying to do:
>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> t
[1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> list(set(t))
[1, 2, 3, 5, 6, 7, 8]
>>> s = [1, 2, 3]
>>> list(set(t) - set(s))
[8, 5, 6, 7]
As you can see from the example resu...
Javascript reduce on array of objects
...a variable in the next iteration.
Iteration 1: a = {x:1}, b = {x:2}, {x: 3} assigned to a in Iteration 2
Iteration 2: a = {x:3}, b = {x:4}.
The problem with your example is that you're returning a number literal.
function (a, b) {
return a.x + b.x; // returns number literal
}
Iteration 1: ...
How to rename a file using Python
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edited Mar 28 '18 at 13:39
Marc-Antoine Giguère
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answered Mar 22 '...
How to correct TypeError: Unicode-objects must be encoded before hashing?
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321
It is probably looking for a character encoding from wordlistfile.
wordlistfile = open(wordli...
C read file line by line
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311
If your task is not to invent the line-by-line reading function, but just to read the file lin...
Illegal pattern character 'T' when parsing a date string to java.util.Date
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3 Answers
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C# vs Java Enum (for those new to C#)
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13 Answers
13
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C++ cout hex values?
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edited Jan 8 '17 at 18:36
answered Jan 26 '09 at 10:39
G...
Clean ways to write multiple 'for' loops
...ure. If
you need a three dimensional matrix, you define one:
class Matrix3D
{
int x;
int y;
int z;
std::vector<int> myData;
public:
// ...
int& operator()( int i, int j, int k )
{
return myData[ ((i * y) + j) * z + k ];
}
};
Or if you want to in...