IT Nursery
When should I use reduceLeft, reduceRight, foldLeft, foldRight, scanLeft or scanRight? I want an intuition/overview of their differences – possibly with some simple examples. 3 Answers 3
Is there any way to map/reduce/filter/etc a Set in JavaScript or will I have to write my own? Here’s some sensible Set.prototype extensions Set.prototype.map = function map(f) { var...
I’m using Python 3.2. Tried this: xor = lambda x,y: (x+y)%2 l = reduce(xor, [1,2,3,4]) And got the following error: l = reduce(xor, [1,2,3,4]) NameError: name 'reduce' is not...
There is nice Array method reduce() to get one value from the Array. Example: [0,1,2,3,4].reduce(function(previousValue, currentValue, index, array){ return previousValue + currentValue; }); What is the best way to...
Say I want to sum a.x for each element in arr. arr = [ { x: 1 }, { x: 2 }, { x: 4 } ]; arr.reduce(function(a, b){...
filter, map, and reduce work perfectly in Python 2. Here is an example: >>> def f(x): return x % 2 != 0 and x % 3 != 0 >>>...
I have to find the average of a list in Python. This is my code so far from functools import reduce l = [15, 18, 2, 36, 12, 78,...