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Solution Review: Returning from a Function

Understand how to write R functions that iterate over integer vectors and return results such as labeling numbers even or odd. This lesson helps you master returning values from functions, updating output dynamically, and applying these skills for effective data processing in R.

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Solution: Returning from a Function

R
evenOdd <- function(testVariable) 
{
  output <- vector("character", 0) # initializing an empty character vector
  
  for(v in testVariable)
  {
    if(v %% 2 == 0)
    {
      # Insert even in vector if conditional statement satisfied
      output <- c(output, "even") 
    }
    else
    {
      # Insert odd in vector if conditional statement not satisfied
      output <- c(output, "odd")
    }
  }
  return(output) # returning the output vector. 
  # You can also simply write output here.
}
# Driver Code
evenOdd(c(78, 100, 2))

Explanation

The input to the function is an integer vector testVariable. We iterate over the entire vector. Then side by side populate the output vector that stores the result - even or odd for all the elements of the input vector. Later, we return the output vector.

Remember, output <- c(output, "even") is updating the variable output by appending an entry to the previous value of the variable output.