Method: Polars::Expr#len

Defined in:
lib/polars/expr.rb

#len ⇒ Expr Also known as: length

Count the number of values in this expression.

Examples:

df = Polars::DataFrame.new({"a" => [8, 9, 10], "b" => [nil, 4, 4]})
df.select(Polars.all.len)
# =>
# shape: (1, 2)
# ┌─────┬─────┐
# │ a   ┆ b   │
# │ --- ┆ --- │
# │ u32 ┆ u32 │
# ╞═════╪═════╡
# │ 3   ┆ 3   │
# └─────┴─────┘

Returns:



778
779
780
 
# File 'lib/polars/expr.rb', line 778

def len
  wrap_expr(_rbexpr.len)
end