Repeat function for simple repetition in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the Kotlin repeat() function do?

The repeat() function runs a block of code a specified number of times. It's a simple way to repeat actions without writing loops manually.

beginner

How do you use repeat() to print "Hello" 3 times?

You write repeat(3) { println("Hello") }. This runs the print statement 3 times.

beginner

What parameter does the repeat() function take?

It takes an integer that tells how many times to repeat the code block.

intermediate

Can you access the current iteration index inside repeat()?

Yes, repeat() provides the current iteration index (starting from 0) as a parameter to the lambda block.

beginner

Write a Kotlin repeat() example that prints numbers 0 to 4.

Use repeat(5) { println(it) }. The it is the current index from 0 to 4.

What does the repeat(4) { println("Hi") } code do?

A Prints "Hi" 4 times

B Prints "Hi" once

C Prints numbers 1 to 4

D Causes an error

The repeat() function runs the code block 4 times, printing "Hi" each time.

What is the type of the parameter passed to repeat()?

A String

B Int

C Double

D Boolean

The repeat() function takes an integer to specify how many times to repeat.

Inside repeat(n) { }, what does it represent?

A The current repetition index starting at 0

B The total number of repetitions

C The last printed value

D The function name

it is the current index of the repetition, starting from 0 up to n-1.

Which of these is a correct way to repeat a block 5 times in Kotlin?

A repeat(5); { /* code */ }

B repeat { 5 /* code */ }

C repeat(5) -> { /* code */ }

D repeat(5) { /* code */ }

The correct syntax is repeat(5) { /* code */ }.

What will this code print? repeat(3) { println(it * 2) }

A 0 1 2

B 1 2 3

C 0 2 4

D 2 4 6

The code prints the current index multiplied by 2: 0*2=0, 1*2=2, 2*2=4.

Explain how the Kotlin repeat() function works and give a simple example.

Think about how you would say 'do this 3 times' in code.

How can you use the iteration index inside the repeat() function? Provide a code snippet.

Remember 'it' is the current count starting at zero.