Pop

Description

Pop the latest expression and return the input(s) of the popped expression.

Usage

<Expr>$meta$pop()

Value

A list of expressions which in most cases will have a unit length. This is not the case when an expression has multiple inputs, for instance in a $fold() expression.

Examples

library(polars)

e1 = pl$lit(40) + 2
e2 = pl$lit(42)$sum()

e1

#> polars Expr: [(40.0) + (2.0)]

e1$meta$pop()

#> [[1]]
#> polars Expr: 2.0
#> 
#> [[2]]
#> polars Expr: 40.0

e2

#> polars Expr: 42.0.sum()

e2$meta$pop()

#> [[1]]
#> polars Expr: 42.0