The Closure Property of Data Types .A method for combining data values satisfies the closure property if: The result of combination can itself be combined using the same method Closure is powerful because it permits us to create hierarchical structures Hierarchical structures are made up of parts,which themselves are made up of parts,and so on Lists can contain lists as elements (in addition to anything else) nThe Closure Property of Data Types •A method for combining data values satisfies the closure property if: The result of combination can itself be combined using the same method •Closure is powerful because it permits us to create hierarchical structures •Hierarchical structures are made up of parts, which themselves are made up of parts, and so on Lists can contain lists as elements (in addition to anything else) 4