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Functional Programming: Reduce() Function in Python

Reducing sequence to a single output value!

Photo by Markus Spiske on Unsplash

Working with reduce() function

reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])
[Output]: 15
got_char("name":"John","profession":"King's Hand","experience_in_year":3),
got_char("name":"Arya Stark","profession":"No One","experience_in_year":4),
got_char("name":"Sansa Stark","profession":"Queen Winterfell","experience_in_year":1),
reduce(lambda acc, char: acc+char, got_chars)/len(got_chars)
[Output]: 2.2
reduce(lambda acc, char: acc+char, got_chars,0)/len(got_chars)
[Output]: 2.2

Grouping values using reduce()

got_char("name":"John","profession":"King's Hand","experience_in_year":3, "sex":"M"),
got_char("name":"Arya Stark","profession":"No One","experience_in_year":4, "sex":"F"),
got_char("name":"Sansa Stark","profession":"Queen Winterfell","experience_in_year":1, "sex":"F"),
got_char("name":"Danaerys","profession":"Queen","experience_in_year":3, "sex":"F")
def reduce_fun(acc,char):
return acc
reduce(reduce_fun, got_chars, {'M':[],'F':[]})
[Output]: {'M': ['John'],
'F': ['Arya Stark', 'Sansa Stark', 'Danaerys']}
from collections import defaultdict
reduce(reduce_fun, got_chars, defaultdict([list]))
defaultdict(<class 'list' >,
{'M': ['John'],
'F': ['Arya Stark', 'Sansa Stark', 'Danaerys']})





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