A method, computer program product and apparatus provide an improved data structure for storing key-value pairs. The data structure comprises six arrays. The method, computer program product and apparatus provide for efficient searching, adding, removal, and iteration of elements. The data structure utilizes a scaled hash code and may store multiple values associated with a same scaled hash code. The required memory is allocated at the time of instantiation, resulting in improved performance. An insertion time of a new key-value pair is a linear function of the total number of key-value pairs.