Function execution flow in Javascript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What happens first when a JavaScript function is called?

The function's code starts running from the first line inside the function block.

beginner

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

It stops the function and sends a value back to where the function was called.

beginner

What happens if a function does not have a return statement?

The function returns undefined by default after finishing all its code.

intermediate

How does JavaScript handle multiple function calls in a row?

Each function runs completely before the next one starts, following the order they were called.

intermediate

What is the call stack in JavaScript function execution?

It is a structure that keeps track of all the functions that are currently running or waiting to finish.

What does the return statement do inside a function?

A Declares a variable

B Starts the function

C Calls another function

D Stops the function and sends a value back

The return statement stops the function and sends a value back to the caller.

If a function has no return, what is its result when called?

A It returns <code>undefined</code>

B It returns <code>null</code>

C It throws an error

D It returns <code>0</code>

Functions without a return statement return undefined by default.

What order do functions run if called one after another?

A Each runs completely before the next starts

B Last called runs first

C All run at the same time

D They run randomly

Functions run one after another, each finishing before the next starts.

What is the call stack used for in function execution?

A To store variables

B To keep track of running functions

C To manage browser tabs

D To save files

The call stack tracks which functions are running or waiting to finish.

When a function is called, where does execution start?

A At the middle of the function

B At the last line of the function

C At the first line inside the function

D At the return statement

Execution starts at the first line inside the function when it is called.

Explain the flow of execution when a JavaScript function is called.

Think about what happens inside the function and what happens after it finishes.

Describe what the call stack is and how it relates to function execution flow.

Imagine a stack of plates where you add and remove plates in order.