Challenge problem

Question

Why does this code

k = list(map(\
lambda x,y:x+y, list(range(100)),list(range(10))
))
print(k)

Output :
[0, 2,4,6,8,10,12,14,16,18]

How does it really work??

Thanks 👍

Answer 1

The lambda takes a value from list( range( 100 ) ) and list( range( 10 ) ) and sum each taken value up.

But even though the first `list` has 100 elements, the lambda can only take 10 out of it because the second `list` only has that many elements.

list( range( 100 ) )
[ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ... , 99 ]

list( range( 10 ) )
[ 0, 1, 2, 3, 4, 5 6, 7, 8, 9 ]

Lambda took a value from each list

0 and 0 => 0
1 and 1 => 2
2 and 2 => 4
....
9 and 9 => 18

I guess it goes like that ...

Answer 2

Thanks Ipang