Lambda Expressions

Lambda expressions are anonymous functions that allow you to encapsulate logic and pass it as an argument to higher-order functions, such as those for processing arrays, lists, or other complex data types. It typically takes a set of input parameters and a body of code that is executed for each element in a collection or for each comparison in sorting logic.

Syntax

-- Take one parameter
<parameter> -> <expression>

-- Take multiple parameters
(<parameter1>, <parameter2>, ...) -> <expression>

Parameter	Description
<parameter1>, <parameter2>, ...	Values that the Lambda will operate on (e.g., elements of an array).
->	Separates the input parameters from the logic.
<expression>	The logic that applies to the input parameters, often written as a conditional or calculation.

Examples

This lambda expression takes a single argument n and adds 5 to it:

n -> (n + 5)

This lambda expression takes an integer x and returns Positive if x is greater than 0, otherwise it returns Non-Positive:

x -> (CASE WHEN x > 0 THEN 'Positive' ELSE 'Non-Positive' END)

This lambda expression checks if num is even. It returns true for even numbers and false for odd numbers:

num -> (num % 2 = 0)

This lambda expression adds the two parameters x and y:

(x, y) -> (x + y)