KOTLIN - LAMBDA FUNCTION

A Lambda or Anonymous Function is a small one liner function that can just have only one expression.

Let us write the Function that adds two numbers and returns the result.

fun add(firstNumber: Int, secondNumber: Int): Int {
	var result = firstNumber + secondNumber
	return result
}

Now, let us write, exactly same Lambda or Anonymous Function for the above add Function.

var add = { firstNumber: Int, secondNumber: Int -> firstNumber + secondNumber }

And we are done.

Note : Just note that a Lambda Function can only have one expression.

Let us see the below example with to add two numbers using Lambda or Anonymous Function.

Example :

fun main() {

    var firstNum = 5
    var secondNum = 4

    var add = { firstNumber: Int, secondNumber: Int -> firstNumber + secondNumber }

    var value = add(firstNum, secondNum)
    println("The added result is "+value)
}

Output :

The added result is 9

So, in the above code, we have the variables, firstNum and secondNum for addition of two numbers.

var firstNum = 5
var secondNum = 4

And in the next line, we call the Lambda or Anonymous Function.

var add = { firstNumber: Int, secondNumber: Int -> firstNumber + secondNumber }

The Lambda or Anonymous Function call is just like any other Function call. And the Lambda Function call is made.

var add = { firstNumber: Int, secondNumber: Int -> firstNumber + secondNumber }

And the Lambda or Anonymous Function is executed, adding two numbers and returning the added result.

And the added result is printed.

The added result is 9

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