How to create lambda and higher order function in Kotlin? type alias in Kotlin
Why Lambdas Were Introduced?
Eliminating "Boilerplate" Code
Treating Functions as "First-Class Citizens"
Powering the Standard Library
Performance Optimizations
A lambda expression, or lambda, is a type of object that holds a block of code. You can assign a lambda to a variable, just as you can any other sort of object, or pass a lambda to a function which can then execute the code it holds. This means that you can use lambdas to pass specific behavior to a more generalized function.
What we’re going to do?
1. Define a lambda.
2. Create a higher-order function.
The lambda starts and ends with curly braces {}. All lambdas are defined within curly braces, so they can’t be omitted.
When you assign a lambda to a variable, you’re assigning a block of code to it, not the result of the code being run. To run the code in a lambda, you need to explicitly invoke it.
Lambda expressions have a type
Just like any other sort of object, a lambda has a type. The difference with a lambda’s type, however, is that it doesn’t specify a class name that the lambda implements. Instead, it specifies the type of the lambda’s parameters and return value.
You can pass a lambda to a function
As well as assigning a lambda to a variable, you can also use one or more as function parameters. Doing so allows you to pass specific behavior to a more generalized function.
A function that uses a lambda as a parameter or return value is known as a higher-order function.
A type alias lets you provide an alternative name for an existing type, which you can then use in your code.
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Guide to watch:
00:00 What is the Requirement of Lambda in Kotlin?
01:49 Why use Lambda in Kotlin?
02:13 How to create a lambda in Kotlin?
06:40 Lambda VS function in Kotlin
10:08 How to explicitly define lambda type in Kotlin?
13:41 How to create lambda with no parameter in Kotlin?
19:12 How to create a lambda with no return type in Kotlin?
21:55 How to use lambda as a parameter in function in Kotlin?
30:17 How to use lambda as a return type in function in Kotlin?
34:54 How type alias works in Kotlin?
#lambda #lambdas #typealias #lambdaInKotlin #kotlin #kotlinLambda #higherOrderFunction #lambdaVSFunction
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