That’s it for part 4! The 5th and final Kotlin for Interviews article covers Frequently Used Code Snippets. forEachIndexed() is like forEach(), except you also have access to the element’s index inside the lambda, which you often need in interview problems.This is the iteration method I use most often in normal projects, but didn’t use as often in interviews because 1) forEach() will throw a ConcurrentModificationException if you try to modify the collection while iterating through it, and 2) a lot of interview problems require taking the index into account as well.

forEach() performs the given action on each element in the collection.The one you’ll encounter the most often is IntRange, but you can use LongRange and CharRange as well. The step, or distance between two values, has a default value of 1. Refresher on RangeĪ Range in Kotlin is a sequence of values defined by a start value, an end value, and a step. Many interview problems require some kind of iteration, be it manipulating an input array or using a map to store information, so I’ll go over different ways of iterating over some common data structures. You can find Part 1: Common Data Types here, Part 2: Collection Functions here and Part 3: Numbers and Math here and Part 5: Frequently Used Code Snippets here. also compiled a cheatsheet that covers all 5 parts of this series, which you can find here. In the following example, we will traverse through the 'Subject' array and we will print the index along with the value.This is Part 4 of Kotlin for Interviews, a series where I go over Kotlin functions and code snippets that came up often during my Android interview prep. forEachIndexed is an inline function which takes an array as an input and its index and values are separately accessible. Nstead of using forEach() loop, you can use the forEachIndexed() loop in Kotlin.

In this article, we will see how we can access the index of an array in Kotlin while using forEach loop.

Sometimes it becomes necessary to access the index of an array.

Foreach index kotlin