Mastering Functions in Computer Science

What is a function in programming?

• A function is a type of variable that stores data.

• A function is a reusable block of code that performs a specific task.

• A function is a graphical representation of data.

• A function is a command that executes only once.

How do you define a function in Python?

• function_name(parameters) =>

• function_name: parameters()

• def function_name(parameters):

• create function_name(parameters)

What is the syntax to call a function in JavaScript?

• function call()

• call functionName()

• functionName()

• functionName;

Explain the purpose of parameters in a function.

• Parameters are used to limit the number of times a function can be called.

• Parameters are only necessary for functions that return values.

• Parameters are used to define the output of a function.

• The purpose of parameters in a function is to allow the function to accept input values, making it reusable and flexible.

How do you return a value from a function in Python?

• Print the value directly without returning it.

• Assign the value to a global variable.

• Use the 'output' keyword to send a value.

• Use the 'return' keyword followed by the value to return.

What is variable scope and why is it important?

• Variable scope refers to the size of a variable in memory.

• Variable scope is the speed at which a variable can be accessed.

• Variable scope is the context in which a variable is accessible in a program, and it is important for managing variable visibility and preventing conflicts.

• Variable scope is the method of declaring variables in a program.

What happens if you try to access a variable outside its scope?

• The variable can be accessed without any issues.

• The variable retains its value outside the scope.

• An error occurs indicating the variable is out of scope.

• The variable is automatically deleted.

How can you pass multiple parameters to a function?

• Use a single parameter with a comma-separated string.

• Call the function without any parameters.

• Define the function with multiple parameters in parentheses, e.g., function myFunction(param1, param2) {} and call it with myFunction(arg1, arg2).

• Define the function without parentheses.

What is the difference between local and global variables?

• Local variables persist for the entire program execution.

• Local variables can be accessed anywhere in the program.

• Local variables are scoped to a function; global variables are accessible throughout the program.

• Global variables are only used within a single function.

How do you debug a function that is not returning the expected value?

• Use print statements or a debugger to trace execution and inspect variable values.

• Restart the programming environment.

• Check for syntax errors in the code.

• Ignore the function and use a different one.