Using input argument variable name as character string

1. How to change the variable name of input argument into character string.

test_fn = function(x){
  deparse(substitute(x))
}

• substitute function returns the unevaluated expression

• Next, deparse function converts the expression returned by substitute into a character string.

2. Run examples.

# Variable
a = 1
print(test_fn(x=a)) # Expected : "a"

## [1] "a"

# Function
print(test_fn(x=mean)) # Expected : "mean"

## [1] "mean"

# Constant
print(test_fn(x=1)) # Expected : "1"

## [1] "1"