Understanding Pass by Value vs. Pass by Reference Have you ever wondered how data is passed in programming? Let's explore two fundamental ways: → Pass by Value: This means a copy of the value is made. → When you pass a variable, you're sending a duplicate of its value. Changes in the function do not affect the original variable. → Commonly used in languages like C and Java for primitive types. → Pass by Reference: Instead of a copy, you pass a reference to the actual variable. → This means changes made in the function will reflect on the original variable. → Frequently seen with objects in languages like Java and Python. How do you ensure you're using the correct method in your code? Leave your thoughts or experiences in the comments! #systemdesign #coding #interviewtips #systemdesign #coding #interviewtips
Billy M.
6mo
The statement for reference is misleading, java is strictly pass by value. In the case of an object being passed a copy of the address is passed pointing to the same object in memory. C++ is a better example of pass by reference, as when a primitive is passed a reference to the point in memory is passed meaning changes reflect to the original.
I remember once, when I switched from PHP to Java, I was happily passing objects into functions, doing all sorts of fancy mutations, and then PROUDLY 😅 returning a ‘new’ object — because, of course, that’s what we do in PHP 😏 . I did this for quite a while before discovering… I didn’t need to return anything at all! 😯 Java had already mutated my poor original object in place 😢 . The day I realized it, I just sat there thinking, ‘Oh wow… this could’ve been catastrophic.’