Checking multiple array elements and return true if all matched

Question

I wanted to find if all emement of below array matched to each other:

val a = Array(1,1,1)
val b = Array(1,0,1)
val c = Array(0,1,1)

here output should be

Array(0,0,1)

as all the value of a(2),b(2) and c(2) is 1 however for all cases it's 0. Is there any functional way of solving this in Scala?

There are several ways to solve this problem, but we are not here to just write the code for you. Please include the code of your attempts to make it work, and we can help you if/when you face problems. — Nordii
– Nordii, Commented May 31, 2019 at 18:53
Will always all arrays will have the same size? Will always be only three arrays? — Luis Miguel Mejía Suárez
– Luis Miguel Mejía Suárez, Commented May 31, 2019 at 18:57

Jeffrey Chung · Accepted Answer · 2019-05-31 19:03:42Z

10

If the arrays are all the same size, then one approach is to transpose the arrays, then map-and-reduce the result with Java's bitwise AND operator &:

val a = Array(1, 1, 1)
val b = Array(1, 0, 1)
val c = Array(0, 1, 1)

val result = Array(a, b, c).transpose.map(_.reduce(_ & _)) // Array(0, 0, 1)

answered May 31, 2019 at 19:03

Jeffrey Chung

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1 Comment

Ashwin Padhy Over a year ago

Thanks @Jeffrey Chung for the code.Its helped me.However to improve functional programming do you have any resources or books to start with.

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