This vs it receiver difference in Kotlin - Quick Revision & Key Differences

Recall & Review

beginner

What does the this keyword refer to in Kotlin lambdas?

<p><code>this</code> refers to the instance of the class where the lambda is defined, not the lambda itself.</p>

beginner

What is the role of it in Kotlin lambdas?

it is the implicit name of the single parameter passed to a lambda when no explicit name is given.

intermediate

How does this differ from it in Kotlin lambda expressions?

<p><code>this</code> refers to the outer class or receiver object, while <code>it</code> refers to the lambda's single input parameter.</p>

beginner

In Kotlin, when do you use it instead of naming the lambda parameter?

When the lambda has exactly one parameter and you don't explicitly name it, Kotlin uses it as the default name.

intermediate

Can this be used inside a lambda to refer to the lambda itself?

<p>No, <code>this</code> always refers to the outer receiver or class instance, not the lambda. To refer to the lambda parameter, use <code>it</code> or name it explicitly.</p>

In a Kotlin lambda with one parameter, what does it represent?

A The single parameter passed to the lambda

B The outer class instance

C The lambda itself

D A keyword to refer to the receiver object

it is the implicit name for the single parameter of a lambda when no explicit name is given.

What does this refer to inside a Kotlin lambda expression?

A The lambda's single parameter

B A local variable inside the lambda

C The lambda itself

D The outer class or receiver object

this refers to the outer class or receiver object, not the lambda parameter.

If you want to refer to the lambda's parameter explicitly, what should you do?

A Use <code>it</code> or name the parameter explicitly

B Use <code>self</code>

C Use <code>this</code>

D Use <code>lambda</code>

You can use it if the lambda has one parameter and no explicit name, or you can name the parameter explicitly.

Which keyword refers to the instance of the class where the lambda is defined?

A it

B this

C self

D lambda

this refers to the instance of the class or the receiver object where the lambda is defined.

When is it NOT available in a Kotlin lambda?

A When the lambda has exactly one parameter

B When the lambda is inside a class

C When the lambda has no parameters

D When <code>this</code> is used

it is only available when the lambda has exactly one parameter and no explicit name is given.

Explain the difference between this and it in Kotlin lambdas.

Think about what each keyword points to inside and outside the lambda.

When should you use it and when should you use this inside Kotlin lambda expressions?

Consider the context of the lambda and the class it is in.