public void clear() {
        if (mSize != 0) {
            freeArrays(mHashes, mArray, mSize);
            mHashes = EMPTY_INTS;
            mArray = EMPTY_OBJECTS;
            mSize = 0;
        }
    }
Make the array map empty.  All storage is released.
core/src/main/java/com/bluelinelabs/logansquare/util/SimpleArrayMap.java