Equivalent to let expressions in r

Question

Is there some equivalent to express let expressions in r? As an example take this simple haskell code:

let x = 1 in x + 1

Many thanks in advance.

Answer 1

Here are a few:

x <- 100

# 1
with(list(x = 1), x + 1)
## [1] 2

# 2
local(x + 1, list(x = 1))
## [1] 2

# 2a
local({
  x <- 1
  x + 1
})
## [1] 2

# 3
eval(substitute(x + 1, list(x = 1)))
## [1] 2

# 4
library(wrapr)
let(c(x = "1"),
  x + 1,
  subsMethod = "stringsubs",
  strict = FALSE)
## [1] 2

x
## [1] 100

Also there is an open issue in the lambda.r package to add let.