The Difference Between Pass By Value and Pass By Reference

Home » Blog » Tips » The Difference Between Pass By Value and Pass By Reference

The Difference Between Pass By Value and Pass By Reference

When a variable is passed by value as an argument, it is passed unchanged. When you don’t need to update the value of a variable, this is handy. This method of supplying parameters is especially beneficial when you don’t want to use memory-intensive arrays or objects. Because this style is mostly used for functions, it is critical to understand the distinctions between it and the other two. The function is called by directly sending the value of the variable as an argument in Pass by value. As a result, any changes made within the function have no impact on the initial value. Parameters supplied as arguments in Pass by value produce their own copy. The term “pass-by-reference” refers to passing the reference of an argument in the calling function to the called function’s corresponding formal parameter. Using the reference supplied in, the called function can change the value of the argument. The fundamental difference between pass by value and pass by reference is that the parameter value copies to another variable in a pass by value, whereas the actual parameter goes to the function in a pass by reference. A computer program is a set of instructions that tells the processor how to do something.

Considering a Situation

The effect of passing an argument by value is undefined, although the parameter’s value is still stored in the function’s array. There are two options for dealing with this scenario. The most convenient method is to pass an item by its name. A string can also be passed by its value. By-value passing is another name for this approach. This approach, however, only works if the argument is supplied by value, so it’s better to utilize it when the variable is passed by value.

Pass By Reference

Passing the reference of an argument in the calling function to the equivalent formal parameter of the called function creates a copy of the actual parameter’s address in memory, i.e. the caller and the callee utilize the same parameter variable. The effect of the callee’s modification of the parameter variable is apparent to the caller’s variable. A reference to an object is a variable passed via reference. It can be used for a variety of things, but it’s best for huge classes and structs. It is more convenient to utilize because it is a pointer.

1. A Quick Overview:

  • Passes a reference to an argument.
  • In the calling code, the callee is a direct reference to the programming element.
  • The saved data’s memory address is passed.
  • The original data is affected by changes to the value.

2. When Should you Utilize a Pass-By-Reference?

Because no new copy of the variable is created when using pass-by-reference, the overhead of copying is avoided. This improves program efficiency, especially when sending huge structs or classes as objects.

3. Things to Be Remembered

When an argument is passed by value, it is passed by reference, unlike a variable passed by value. A variable is a pointer to a specific object. Changes to the parameter have no effect on a variable passed by reference. An argument that is referred to via reference cannot modify an object. Changes to the argument have no effect on an object that is supplied by value. You should avoid using the ‘value’ keyword if you intend to pass an object via reference.

Pass By Value:

The term “pass by value” refers to the creation of a memory copy of the real parameter’s value, i.e. the caller and callee have two independent variables with the same value. The consequence of the callee changing the parameter value is not visible to the caller.

  1. Impression:
  • Passes a value as an argument.
  • The underlying element in the calling code is not accessible to the callee.
  • The callee receives a copy of the data.
  • The real value is unaffected by changes to the passed variable.

When Is It OK to Use Pass By Value?

We don’t have to worry about objects being modified by other threads if we’re writing a multi-threaded application. In a distributed application, pass-by-value can reduce the overhead of keeping objects in sync over the network.

  • Significant Findings:

When an argument is supplied by value, only the module with the same name as the argument can see it. This signifies that changes in the parameter variable have no effect on the value of an object. Whether the reference variable is a string or an integer makes no difference. The value of an object is passed to the function when it is passed by value, which is not a problem. The end result will be the same, albeit it may take a little longer to complete if you require multiple instances.

Advantages of Pass By Value

Passing by value is a simple alternative to passing by reference. It prevents side effects, as the name implies. Pass by reference has the disadvantage of using pointers instead of addresses. As a result, if you pass an object by value, it will only be accessible once the function has started. A function can’t change its own values if an object isn’t provided by value. The order in which inputs are evaluated by the compiler is the only distinction between pass by value and pass by reference.

Advantages of Using a Pass-By-Reference System

The following are some of the benefits of passing by reference. Because no new copies of the variable are created, the overhead of copying is reduced. This makes the application run faster, especially when supplying huge structs or classes as objects. You can pass an array or an object, and the original value of a function may need to be changed on occasion.

What Is the Distinction Between Pass By Value and Pass By Reference?

When you’re only “using” a parameter for computation and not modifying it for the client program, use pass-by-value. A copy of the address of the real argument is maintained in a pass-by-reference (also known as pass-by address). Pass by value refers to a method of copying the value of a function parameter to another variable, whereas pass by reference refers to a method of passing the function’s real parameters. As a result, the fundamental distinction between pass by value and pass by reference is this.

When Should You Utilize Passing By Reference?

If you want to change the parameter value in the calling function, use pass-by-reference. If you must pass parameters, use pass-by-value. Because pointers; unlike references, can be NULL or redistributed. If NULL is a permissible parameter value or if you want to reassign the pointer, use pass-by-pointer.

What Are Some of the Perks of Using Pass By Reference Rather than Pass By Value?

The term “passing by value” refers to passing the variable’s actual value into the function. As a result, it would pass the value 9 in your example. The term “passing by reference” refers to passing the variable itself into a function (not just the value). So, in your case, an integer object with the value 9 would be passed.

In C++, Why Do We Utilize Pass By Reference?

The term “pass-by-reference” refers to passing the reference of a calling function argument to the called function’s corresponding formal parameter. If you want to change the parameter value in the calling function, use pass-by-reference. If you must pass parameters, use pass-by-value.

In JavaScript, What is the Difference Between Pass-By-Value and Pass-By-Reference?

The difference between pass-by-value and pass-by-reference is that pass-by-value creates new memory space and copies a value, whereas pass-by-reference does not. Instead of making a copy, pass-by-reference does exactly what it says on the tin: it references an item in memory.

In PHP, What is the Difference Between Passing By Value and Passing By Reference?

The modifications made inside the function are not reflected in the original value when using the pass-by-value. Changes performed inside the function, on the other hand, are mirrored in the original value in pass-by-reference. As a result, an additional distinction between pass by value and pass by reference exists.

In Kotlin, How Do You Pass References?

  • A Wrapper class is used. The goal is to make a reference class with the integer as a member field.
  • Arrays are used. To wrap an integer, we can use an array of length one.
  • AtomicInteger is used.

Is it Preferable to Pass By Value or By Reference?

Because it does not replicate the arguments, pass-by-references are more efficient than pass-by-value. The formal parameter is the argument’s alias. The called function actually reads or writes the argument when it reads or writes the formal parameter.

Is It Faster to Pass By Reference?

If the quantity of data transferred by value is larger than the size of a pointer, passing by reference or pointer is usually faster than passing by value.

Is It True that Passing By Reference Saves Memory?

The underlying object is not replicated when an object (or built-in type) is supplied by reference to a function. The object’s memory address is sent to the function. Because no new memory is allocated and no (expensive) copy constructors are used, this saves both memory and CPU cycles.

In SAP ABAP, What is the Difference Between Pass By Value and Pass By Reference?

When a parameter is supplied by reference, the exporting parameter does not always have an initial value, as shown in the following example using the do-nothing method. Only if the method is completed without errors is the updated content of the parameter assigned to the actual parameter when sending by value.

Pass By Value vs. Pass By Reference: What’s the Difference?

  1. Definition:

Pass by value refers to a method of copying the value of a function parameter to another variable, whereas pass by reference refers to a method of passing the function’s real parameters. As a result, the fundamental distinction between pass by value and pass by reference is this.

  • Changes:

Changes performed inside a function are not reflected in the original value when using pass-by-value. Changes performed inside the function, on the other hand, are mirrored in the original value in pass-by-reference. As a result, an additional distinction between pass by value and pass by reference exists.

  • Actual Dimensions:

Furthermore, pass-by-value copies the actual parameter. Pass by reference, on the other hand, passes the address of the real parameter to the function.

  • Association with Function:

Another distinction between pass by value and pass by reference is that in a pass by value, the function receives a copy of the real content, but in a pass by reference, the function accesses the content of the original variable.

  • Memory Requirement:

Additionally, the pass-by-value method uses more memory than the pass-by-reference method.

  • Time Required:

Another distinction between pass-by-value and pass-by-reference is the time requirement. Passing by value takes longer since it includes copying values, whereas passing by reference takes less time because there is no copying.

Conclusion

The major difference between pass by value and pass by reference is that the parameter value copies to another variable in a pass by value, whereas the actual parameter goes to the function in a pass by reference. The fundamental difference between pass by value and pass by reference is that the parameter value copies to another variable in a pass by value, whereas the actual parameter goes to the function in a pass by reference. A computer program is a set of instructions that tells the processor how to do something. To develop efficient and effective programs, programmers use a variety of principles. Function, which is a collection of reusable statements, is one of them. Instead of putting all of the statements in one program, you can break it up into numerous functions and call them from the main program. As a result, the programs are easier to manage and maintain. There are two ways to call a function in this case. They do it by passing by value or by reference.

About the author

Indu has been educator since last 10 years. She can find all kind of scholarship opportunities in the USA and beyond. She also teach college courses online to help students become better. She is one of the very rare scholarship administrator and her work is amazing.

Leave a Comment