CodeWars: One Line Task Check Range Solution

Approach

i < x == i > y
:

  • if both
    false
    , then condition will be
    true
  • there will be no both
    true
    on both, so other will result in
    false

map
here is just for iterating, the point here is accumulated
c

array|c
to grab
c
, because binary representation of array (NaN) OR a number will always result in that number

Implementation

1// prettier-ignore
2checkRange=(a,x,y,c=0)=>a.map(i=>c+=i<x==i>y)|c

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