Assign add

this needs to be tested...

Usage

e1 %=+% e2

e1 %=-% e2

Arguments

e1

Object to be updated

e2

right side statement

Examples

val <- 1
val %=+% 2
val # 3
#> [1] 3
val %=+% 2
val # 5
#> [1] 5
val %=-% 1
val # 4
#> [1] 4
if (FALSE) {
val %=+% c(1, 2, 3) # fails
}
val <- c(1, 2, 3)
val %=+% c(1, 2, 3) # 2 4 6