Awesome

Immutequality: Emulate Immutability With Equality Operator

This is a small "though experiment" to make R emulate the difference between = ("is"), and <- ("becomes") as distinguished e.g. in F#. In other words = makes a "promise" that x = 10 means that x won't change for the remainder of the defining scope.

Example

library(immutequality)
## or, more silently and explicitely:
# import::from(immutequality, "=") 

x = 10

print(x)

# Will raise an error!
x <- x*2

# This also
assign("x", 20)

# .. and this too
x = 20