Well, what is a FOR loop? Basically, it is a part of the programming language Kotlin that allows you to iterate through a collection of objects in a loop. You can use the loop to perform various operations on each item in the collection in turn. Sounds simple? Let’s explore!

I’ve been learning Kotlin for a few months now. The learning curve is steeper than Java, but it’s also easier. I recently came across a FOR loop in Kotlin.

Kotlin is a new programming language born from the mind of JetBrains that aims to bring the power of modern programming languages into the hands of everyone interested in the subject. Kotlin is a language with a strong and precise type system and a powerful support library, with the ability to integrate with existing Java/Kotlin code.

In this blog, we will explore FOR loop in Adnroid kotlin, we will see the exact flow of the for loop. How it works We will discuss the working of the FOR loop in detail with the help of an example. So let’s get started.


The FOR loop syntax is for, followed by a space, open and closed parentheses. In this one I just used the variable i followed by the in operator and defined the range. word-image-2971 for (initializer in ranges) { // put your code here }

Consider a simple example

fun main(args : Array) { // Loop for for (i in 1..20) { println(i) } }

FOR loop Example

Let’s look at the simplest example of the FOR loop. Open the IDE and insert the following code fun main(args : Array) { for (i in 1..3) { println(hi…) } } Now let’s run the code and see the output on the console Hi, uh… hi… hi… Process completed with exit code 0 Here we simply show that the println() method was executed three times. That is, cycle 1, cycle 2 and cycle 3 have been completed. After the third loop, the loops really stop.

What is the exact sequence of the FOR loop.

word-image-2972 To understand the exact procedure, we take an example, see the following code

1 repetition

In the first iteration (loop 1), the value of i is actually 1 (i=0), and the next step is to check whether the condition for 1 is between 1 and 3. So the condition becomes true, then we just print hi, and finally, at the end of the loop, we increase the value of i by 1 so that the value of i now becomes 2 (i=2). word-image-2973

2 Repetition

The value of i=2 is now the starting point for iteration 2. If at the second iteration we need to check again that 2 is between 1 and 3, and the condition becomes true again, and we print hi again, at the end of the iteration we simply increase the value of I and i becomes 3 (i=3). word-image-2974 Now, i=3 is the starting value of loop 3, or you could say the starting point of loop 3. And the win condition becomes true. Because this 3 is actually present in a range of 1 to 3. word-image-2975 Once again, we print a greeting. Finally, the value of i becomes 4 (i=4). Now, at the end of cycle 3, when the value of i becomes 4, an attempt is made to start cycle 4. This will never happen because i=4 would make the condition false. The number 4 is not in range. The result is that the cycle ends correctly. word-image-2976

FOR cycle overview

The overview will eventually look like the following figure. word-image-2977

FOR loop Example

To understand this better, let’s take another example. Now suppose I need to write a program that uses the FOR loop to output all even numbers from 1 to 20. To do this, I just write an if else condition. For example, below fun main(args : Array) { // loop For for (i in 1..20) { if (i % 2 == 0) println(i) } } Now let’s run the code. So we start with 2,4,6,8…,20. So we print all the event numbers with this pre-loop example. 2 4 … .. 18 20 Process completed with output code 0


In this post, we learned how the FOR loop works in Kotlin. Thanks for reading, have a great day.A for loop is a for loop. It’s a loop that iterates the elements of a list. So what’s the big deal? Well, if you’re looking for a tool to iterate over a list of objects, then you have a very simple answer: Kotlin’s for-in syntax is the perfect match for this task.. Read more about kotlin for loop with condition and let us know what you think.

Frequently Asked Questions

How do you write a for loop in Kotlin?

Kotlin is a programming language that grew out of the JVM and Android, and it has some features that make writing Kotlin code more fun and productive. One of those features is the for in loop, which is simple and very useful for structured data. You know that you’ve got a good for loop when it’s easy to read, easy to write, and it does exactly what it’s supposed to do. In the Kotlin standard library, there are two main ways to write for loops: the for loop and the range operator. In this post, let’s focus on the standard library’s for loops.

What is Loop in Kotlin?

Kotlin has a new keyword — loop . A loop is a construct that is used to iterate over a collection of data. In Kotlin, loops are used to loop over lists, arrays, strings, tuples, sets, dates and any other collection data type. Loop in Kotlin is a useful feature for any collection-based programming language like Kotlin. In this article we will learn how to use loop in Kotlin. Kotlin has a loop primitive that allows you to loop through collections of data in ways that aren’t possible with Java. While there are other looping primitives in Java, which can be used in functional style, such as the Iterable class, they aren’t nearly as powerful as the loop primitive that Kotlin provides.

How do you iterate in Kotlin?

Kotlin is a statically typed programming language developed by JetBrains and used by many other companies. It’s main feature is its support for functional programming, but it also supports the use of objects and allows you to create libraries of classes. Kotlin is a modern, type-safe programming language for the Java Virtual Machine (JVM). Kotlin is a statically-typed language that runs on the JVM, Java SE, or Android. In the past year, Kotlin has become one of the most popular languages for Android development, and it has even been integrated into the open source Android Studio IDE. One of the most exciting new features of Kotlin is its inline, or “inline,” functions. Inline functions can be used just like any other function, but the compiler will inline them, meaning that your function will be compiled into a single entity.

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