What this keyword represents in Javascript - Cheat Sheet & Quick Revision

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beginner

What does the this keyword represent in JavaScript?

The this keyword refers to the object that is currently executing the code. It changes depending on how a function is called.

intermediate

In a regular function, what does this refer to in strict mode?

In strict mode, this inside a regular function is undefined. Without strict mode, it refers to the global object (like window in browsers).

intermediate

How does this behave inside an arrow function?

Arrow functions do not have their own this. They inherit this from the surrounding (lexical) scope.

beginner

What does this refer to when used inside an object method?

Inside an object method, this refers to the object that owns the method.

intermediate

How can you explicitly set the value of this when calling a function?

You can use call(), apply(), or bind() methods to explicitly set this when calling a function.

What does this refer to inside a regular function called in the global scope (non-strict mode)?

A The function itself

B The object that called the function

C Undefined

D The global object (e.g., window in browsers)

In non-strict mode, this inside a regular function called globally refers to the global object.

Inside an arrow function, this is:

A Bound to the arrow function itself

B Inherited from the surrounding scope

C Always the global object

D Undefined

Arrow functions inherit this from their surrounding lexical scope.

Which method can be used to permanently set this for a function?

A bind()

B apply()

C call()

D setThis()

bind() returns a new function with this permanently set.

In an object method, this refers to:

A Undefined

B The global object

C The object owning the method

D The method itself

Inside an object method, this points to the object that owns the method.

What is the value of this inside a function in strict mode if called without an object?

A Undefined

B The function itself

C The last object used

D The global object

In strict mode, this is undefined when a function is called without an object.

Explain how the value of this changes depending on how a function is called in JavaScript.

Think about different ways to call functions and how this behaves.

Describe the difference between this in regular functions and arrow functions.

Focus on how this is determined inside each function type.