codewars #76 Ones and Zeros (7kyu)

 #76 Ones and Zeros

Given an array of one's and zero's convert the equivalent binary value to an integer.

Eg: [0, 0, 0, 1] is treated as 0001 which is the binary representation of 1.

Examples:

Testing: [0, 0, 0, 1] ==> 1

Testing: [0, 0, 1, 0] ==> 2

Testing: [0, 1, 0, 1] ==> 5

Testing: [1, 0, 0, 1] ==> 9

Testing: [0, 0, 1, 0] ==> 2

Testing: [0, 1, 1, 0] ==> 6

Testing: [1, 1, 1, 1] ==> 15

Testing: [1, 0, 1, 1] ==> 11

However, the arrays can have varying lengths, not just limited to 4.

import java.util.List;
import java.util.stream.Collectors;

public class BinaryArrayToNumber {

    public static int ConvertBinaryArrayToInt(List<Integer> binary) {
        // Your Code
        return Integer.parseInt(String.join("",binary.stream().map(String::valueOf).collect(Collectors.joining())), 2);
    }
}