What Does Mean In Kotlin

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In Kotlin, the mean function is used to calculate the average of a collection of numbers. As an avid Kotlin developer, I have frequently used this function in my projects to perform mathematical calculations and analyze data. In this article, I will go deep into detail about the mean function in Kotlin and provide personal insights and commentary along the way.

Understanding the mean function

The mean function in Kotlin is an extension function that can be called on any collection of numbers. It returns the arithmetic mean, also known as the average, of all the numbers in the collection. The mean is calculated by summing up all the numbers and dividing the sum by the total number of elements in the collection.

For example, consider the following Kotlin code:

val numbers = listOf(1, 2, 3, 4, 5)
val average = numbers.mean()

In this code, we have a list of numbers [1, 2, 3, 4, 5]. By calling the mean function on this list, we will obtain the average of these numbers, which is 3.

One thing to note is that the mean function only works with numeric types, such as integers or floating-point numbers. If you try to call the mean function on a collection of non-numeric types, the compiler will throw an error.

Personal Insights and Commentary

As someone who has extensively used the mean function in Kotlin, I can confidently say that it is a powerful and convenient tool for performing calculations and analyzing data. It saves us from writing repetitive code to calculate the mean manually and allows us to focus on the higher-level aspects of our projects.

The mean function is particularly useful when working with large collections of numbers or when dealing with complex mathematical operations. It significantly simplifies the code and improves its readability. I often use it in data science projects to calculate the average value of a dataset and gain insights into the data distribution.

Another great feature of the mean function is its compatibility with other functions and operations in Kotlin. For example, we can combine the mean function with other collection functions, such as filter or map, to perform more advanced calculations or transformations on the elements.


The mean function in Kotlin is a handy tool for calculating the average of a collection of numbers. Its simplicity and compatibility with other functions make it a valuable asset for any Kotlin developer. Whether you are working on a data analysis project or simply need to perform mathematical calculations, the mean function will save you time and effort.

So, the next time you find yourself needing to calculate the mean of a collection of numbers in Kotlin, don’t hesitate to use the mean function. It will make your code more concise, readable, and efficient.