Monday , January 10 2022

Higher Order Functions in Kotlin with Example – Android Coding by DMTechnolab

This post is about Higher Order Work in Kotlin.

There is one good thing about Kotlin; It also supports functional programming. This means that the Kotlin functions can be stored in a variable, passed to other functions as arguments and also returned from a function.

He said that the government has taken several steps to prevent such incidents.He said that the government has taken several steps to prevent such incidents.He said that the government has taken several steps to prevent such incidents.He said that the government has taken several steps to prevent such incidents.He said that the government has taken several steps to prevent such incidents.

What are the higher order functions in Kotlin?

As I said in Kotlin that we can store functions in variables, we can pass them as arguments to other functions and we can also return functions from functions. When we accept a function as an argument or return a function, we call it a function Higher order function.

Sounds confusing? 4

Here is an example for you.

Defining a higher order function

Here is a simple higher order function.

Let us understand the third parameter in the function given above.

Higher Order Work in KotlinHigher Order Work in Kotlin
Act as a parameter

The picture above explains, how can you define a function as a parameter. Now we will try to call this function.

Calling a higher order function

Now, let’s call our higher order function.

We will get the following output.

Let us understand how we pass a function as a parameter.

Higher Order Work in Kotlin - 1Higher Order Work in Kotlin - 1
Passing function as an argument

In the above picture we are using the following snippet to pass the third parameter to the function Throw the dice())

And it’s called A. Lamb expression. And we can also store it in a variable.

Trailing lamba

In our example, the function Throw the dice()) Is a higher order function that is accepting another function as an argument. And the function we defined as the argument is the last parameter. When we have this condition, we can place the vertical expression outside the parentheses while calling the function.

You look cool?

This keyword

Another interesting thing is that when our lambda expression has only one parameter, we can skip the parameter name and instead of writing a name that we can use This is the keyword To get the parameter.

Another cool feature right?

Now, one more interesting thing I would like to mention; When your function is the only parameter that is a function, in this case you can also omit the parentheses.

Assign null as the default value

We can also assign null as the default value.

When you have zero as the default value, you can use Clarion call()) To call a function.

very nice? Or are you still confused?

If you are still confused, you may be wondering why to complicate things. But trust me this is a very useful and useful thing.

Imagine a scenario when you are performing a heavy operation (which requires a long time to execute) in a separate thread inside a function. And after completing that task you need a callback. You can achieve this by using it very easily. Higher Order Work in Kotlin.

Try running this code in your machine.

So all this is for higher order functions in Kotlin. If you have some input to improve this post, please comment below. Questions welcome. Please share this post with your friends if you think it was useful. Thank you.

Belal Khan ProfileBelal Khan Profile

Hi, my name is Belal Khan and I am Google Developers Specialist (GDE) for Android. A passion for teaching made me this blog. If you are an Android developer, or you are learning about Android development, I can help you a lot with simplified coding.

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