Simulated change of immutable objects during execution runtime

A system for executing software, comprising:

• a computing device comprising at least one processor and non-transitory memory storing instructions for a code execution module such that, when the instructions are executed by the at least one processor, the at least one processor will:
• receive software for execution by the code execution module;
• recognize that one or more immutable and referentially transparent software nodes are denoted as immutable and referentially transparent by the software;
• execute a first portion of the software with values assigned to the one or more immutable and referentially transparent software nodes;
• determine that the software comprises an instruction to begin a simulated change of the one or more immutable and referentially transparent software nodes during runtime while retaining logical immutability of the one or more immutable and referentially transparent software nodes;
• cache a value or output of the simulated change to the one or more immutable and referentially transparent software nodes;
• store the simulated change to the one or more immutable and referentially transparent software nodes in a simulated change apparatus;
• using the simulated change apparatus, perform one or more operations of a second portion of the software as if the one or more immutable and referentially transparent software nodes had been changed in the non-transitory memory, while the one or more immutable and referentially transparent software nodes actually remain unchanged, the one or more operations including an operation that relies on the one or more immutable and referentially transparent software nodes, such that the cached value or output is retrieved and used instead of recalculating the value or output;
• and
• output results of the one or more operations.