Understanding JavaScript Functions

What is a function in JavaScript?

• A function in JavaScript is a type of variable.

• A function in JavaScript is a method for creating objects.

• A function in JavaScript is a data structure that holds values.

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

How do you define a function in JavaScript?

• myFunction(param1,param2) => function {}

• function myFunction(param1, param2) { // function body } or const myFunction = (param1, param2) => { // function body }

• function:myFunction(param1,param2){}

• const myFunction = function(param1, param2)

What is the purpose of a return statement in a function?

• The purpose of a return statement in a function is to exit the function and return a value to the caller.

• To define a variable within the function

• To create a loop in the function

• To comment the code in the function

What are parameters in a function?

• Parameters are the main function body.

• Parameters are constants defined outside the function.

• Parameters are variables in a function that accept input values.

• Parameters are the return values of a function.

What are arguments in a function?

• Arguments are the inputs provided to a function.

• Arguments are the conditions that a function checks before execution.

• Arguments are the outputs returned by a function.

• Arguments are the variables declared within a function.

How do you call a function in JavaScript?

• function call()

• call functionName

• invoke functionName()

• functionName()

What is the difference between parameters and arguments?

• Parameters are the values passed to a function; arguments are the function's definition.

• Parameters are part of the function definition; arguments are the values supplied to the function.

• Parameters are optional; arguments are always required.

• Parameters and arguments are the same thing, used interchangeably.

What is scope in JavaScript?

• Scope in JavaScript defines the visibility and lifetime of variables and functions.

• Scope refers to the speed of JavaScript execution.

• Scope is a method for optimizing JavaScript performance.

• Scope is a type of JavaScript variable.

What is the difference between local and global scope?

• Local scope is accessible throughout the entire program; global scope is limited to a function or block.

• Local scope is limited to a function or block; global scope is accessible throughout the entire program.

• Local scope refers to variables that are always available; global scope refers to variables that are only sometimes available.

• Local scope can be accessed from anywhere in the program; global scope is only available within its own function.

What does hoisting mean in JavaScript?

• Hoisting means that variables can be declared after they are used.

• Hoisting is the process of moving variable and function declarations to the top of their scope.

• Hoisting refers to the automatic garbage collection of variables.

• Hoisting is the process of deleting unused variables from memory.