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How to pass function as parameter in Kotlin

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In this blog, we are going to see how kotlin lambda expression makes our code more expressive and concise. Recently, I’ve noticed that there are a few different ways to pass a function as a parameter. In this post I will use 2 functions: We have to declare the method, in such a way that it can receive the method as an argument. The most common and often more convenient (according to Kotlin documentation) is to pass a lambda expression.

1. Pass a lambda expression

In the above example, we have passed a lambda expression to calculateSum() method which will return the sum of these variables after execution of divide function. This is how we write lambda expression in a function:  Expression_Name(Param1,Param2,Param3)->RetrunType

2. Pass lambda expression directly without passing method

In this 2 example, we have lambda expression directly without passing method itself in the previous example we have passed the divide() function as the parameter. Regular functions receive only data parameters, whereas a function that receives another function as a parameter or returns a function, as a result, is called a Higher-order function. So, our functions that receive a lambda callback are basically higher-order functions.

 

Hope this blog will give you a basic idea of how we can pass lambda express or function to a method.

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