What are closures in R How are they useful

This recipe explains what are closures in R How are they useful

Recipe Objective

What are closures in R? How are they useful?

Closures are used for creating functions within a function in the R environment. These are useful when the functions are changing/ repeating in the code with the same dataset. The application of closure is where the functions are first-class objects, in which functions are returned as results from a high order function or which can also be passed as arguments to some other functions. This recipe demonstrates examples of closures functions in R.

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Step 1 - Create closure functions

Lets create a function that increases the number value by 5 %

func_5 <- function(base) { base * 1.05}

Now, lets create a function that decreases the number value by 3 %

func_3 <- function(base) { base * 0.97}

Create a closure function : That can return the output for any type of request of either increasing or decreasing the number with a certain present value.

func <- function(change){function(base){base * change}}

Step 2 - Test the function

a = func(1.05) b = func(0.97) a(100)

"Output of code is:"
105

b(100)

"Output of code is:"
97

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