Repeat function for simple repetition in Kotlin - Step-by-Step Execution

Concept Flow - Repeat function for simple repetition

Start

↓

Call repeat(n)

↓

Initialize counter i=0

↓

Check i < n?

No→End repeat

Yes↓

Execute block

↓

Increment i

↩Back to Check

The repeat function runs a block of code n times by counting from 0 to n-1 and executing the block each time.

Execution Sample

Kotlin

repeat(3) {
    println("Hello")
}

This code prints "Hello" three times using repeat.

Execution Table

Iteration	i (counter)	Condition i < 3	Action	Output
1	0	true	Execute block	Hello
2	1	true	Execute block	Hello
3	2	true	Execute block	Hello
4	3	false	Exit repeat

💡 i reaches 3, condition 3 < 3 is false, so repeat stops

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
i	-	0	1	2	3

Key Moments - 2 Insights

Why does the repeat function start counting from 0 instead of 1?

The repeat function uses zero-based counting, so i starts at 0 and goes up to n-1. This is shown in the execution_table where i goes 0,1,2 for repeat(3).

What happens when the counter i equals n?

When i equals n (3 in this case), the condition i < n becomes false, so the repeat loop stops. This is the exit condition shown in the last row of execution_table.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of i during the third iteration?

A 2

B 3

C 1

D 0

💡 Hint

Check the 'i (counter)' column in the third row of execution_table.

At which iteration does the repeat function stop executing the block?

A After iteration 2

B After iteration 4

C After iteration 3

D After iteration 1

💡 Hint

Look at the 'Condition i < 3' column and see when it becomes false in execution_table.

If repeat(5) was used instead, how many times would the block execute?

A 3 times

B 4 times

C 5 times

D 6 times

💡 Hint

repeat(n) runs the block exactly n times, as shown in variable_tracker and execution_table.

Concept Snapshot

repeat(n) { block }
- Runs block n times
- Counter i goes from 0 to n-1
- Stops when i == n
- Simple way to repeat code without loops

Full Transcript

The Kotlin repeat function runs a block of code a set number of times. It starts counting from zero and runs the block while the counter is less than n. When the counter reaches n, it stops. For example, repeat(3) runs the block three times with i values 0, 1, and 2. This is a simple way to repeat actions without writing a full loop.