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# R Functions

Functions are a blocks of code that perform a specific task.
They help in modularizing the code, making it more readable, maintainable, and reusable.

Syntax
function_name <- function(arg1, arg2, ...) {
# Function body
# Code to perform the task
return(result)
}

1. function_name - Declare a function name.
2. arg1, arg2, ... - Input parameters (arguments) either 0 or more that the function expects.
3. return(result) - The output that the functions expects.

## Example

``````# Define a function
result <- a + b
return(result)
}

# Use the function
print(sum_result)  # Output: 8``````

You can place even more arguments and can use the function any number of times

## Returning Multiple Values

You can return multiple values in one function.

## Example

``````# Function returning multiple values
calculate_stats <- function(data) {
mean_value <- mean(data)
median_value <- median(data)
return(list(mean = mean_value, median = median_value))
}

# Use the function
data <- c(1, 2, 3, 4, 5)
stats <- calculate_stats(data)
print(stats\$mean)
print(stats\$median)``````

Here we used multiple values with its respective variable in a list form and return the values.
We use dollar (\$) sign after the function name to get the value of a variable we want.

## Anonymous Functions (Lambda Functions)

you can declare a statement in one line without return value

## Example

``````# Anonymous function (lambda function)
square <- function(x) x^2
# is equivalent to
square_lambda <- function(x) { return(x^2) }

# Use the anonymous function
result1 <- square(4)
result2 <- square_lambda(4)``````

## Nested Functions

You can declare a function within other function

## Example

``````# Outer function
outer_function <- function(a, b) {

# Nested function
inner_function <- function(x, y) {
result <- x + y
return(result)
}

# Using the nested function
nested_result <- inner_function(a, b)

# Returning the result
return(nested_result)
}

# Using the outer function
final_result <- outer_function(3, 5)
print(final_result)  # Output: 8``````

# Quick Recap - Topics Covered

R Functions
Nested Functions

## Practice With Examples in Compilers

The Concepts and codes you leart practice in Compilers till you are confident of doing on your own. A Various methods of examples, concepts, codes availble in our websites. Don't know where to start Down some code examples are given for this page topic use the code and compiler.

## Example JS

Example 1 Example 2 Example 3 Example 4 Example 5

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