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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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package org.javimmutable.collections;

import javax.annotation.Nonnull;

/**
 * Extension of Iterable for objects whose iterator method returns a SplitableIterator.
 */
public interface SplitableIterable
    extends Iterable
{
    @Override
    @Nonnull
    SplitableIterator iterator();

    /**
     * Processes every value using the provided function.
     */
    default  void forEachThrows(@Nonnull Proc1Throws proc)
        throws E
    {
        for (T value : this) {
            proc.apply(value);
        }
    }

    /**
     * Apply the specified accumulator to all elements in iterator order calling the accumulator function
     * for each element.  The first call to accumulator is passed initialValue and first element in the sequence.
     * All remaining calls to accumulator are passed the result from the previous call and next element in the sequence.
     *
     * @param initialValue value passed to accumulator on first call
     * @param accumulator  method called to compute result
     * @return result from last call to accumulator
     */
    default  V reduce(V initialValue,
                         Func2 accumulator)
    {
        V answer = initialValue;
        for (T value : this) {
            answer = accumulator.apply(answer, value);
        }
        return answer;
    }

    default  V reduceThrows(V initialValue,
                                                    Sum1Throws accumulator)
        throws E
    {
        V answer = initialValue;
        for (T value : this) {
            answer = accumulator.apply(answer, value);
        }
        return answer;
    }
}