View difference between Paste ID: 0u68K0W8 and pg4DbZjg

 package ch.claude_martin.foo;
 
 import java.util.Arrays;
 import java.util.function.BinaryOperator;
 
 public class SomeClass {
 	static class Binary {
 
 		public static Binary ZERO = new Binary(false);
 		public static Binary ONE = new Binary(true);
 		private final boolean value;
 
 		private Binary(boolean value) {
 			this.value = value;
 		}
 
 		public static Binary of(boolean b) {
 			return b ? ONE : ZERO;
 		}
 
 		public Binary add(Binary b) {
 			return new Binary(b.get() || value);
 		}
 
 		public boolean get() {
 			return value;
 		}
 
 		@Override
 		public String toString() {
 			return value ? "1" : "0";
 		}
 	}
 
 	public static void main(String[] args) {
 		Binary[] numbers = new Binary[] { Binary.ZERO, Binary.ZERO, Binary.ONE, Binary.ZERO };
 		System.out.println(sum(numbers, Binary.ZERO, Binary::add));
 	}
 
 	public static <T> T sum(T[] array, T zero, BinaryOperator<T> accumulator) {
-		return Arrays.stream(array).reduce(zero, accumulator);
+		T result = zero;
 		for (T element : array)
 			result = accumulator.apply(result, element);
 		return result;
 	}
 }