grapes-equals-grapes: Subtraction variable reassignment

In infixit: Helpful Additional Infix Functions

Subtraction variable reassignment

Description

Updates the left-hand, numeric type object by subtracting the right-hand value from it, reassigning the difference to the left-hand object.

Usage

lhs %-=% rhs

Arguments

lhs	An numeric object existing in the global/ parent environment.
rhs	A numeric value to subtract from the lhs

Details

Currently in R, if you want to update the value of a numeric object to be the outcome of some arithmetic operation, you have to initialize the object and then reassign it. For example: apple <- 1 and then apple <- apple - 1. This sort of thing is generally referred to as augmented variable assignment. This function allows users to update the value of an object through subtracting the value on the right-hand side.

Value

Returns the arithmetically-updated left-hand object into the environment the operation was performed in.

Examples

{

example <- 10
example %-=% 3
example # returns 7

}

infixit documentation built on June 8, 2025, 10:52 a.m.