értékmásolás

Értékmásolás refers to the concept of value copying in computer programming. It describes a mechanism where the value of a variable is duplicated when it is assigned to another variable or passed as an argument to a function. In systems that use value copying, changes made to the copied value do not affect the original value. This is in contrast to reference copying, where both variables or the parameter and argument point to the same underlying data in memory, and modifications to one will be reflected in the other.

Many programming languages, particularly those that use primitive data types like integers, floats, and booleans, employ value copying by default. When you assign an integer variable to another integer variable, for instance, a new copy of the integer's value is created. This ensures data integrity and predictability, as operations on one variable are isolated from operations on another that was derived from it via copying.

Understanding whether a language or data type uses value copying or reference copying is crucial for writing correct and efficient code. It impacts how data is managed in memory and can prevent unexpected side effects. For complex data structures like objects or arrays, the behavior can sometimes be more nuanced, with some languages offering both value and reference semantics depending on the context or specific implementation.