Method: Polars::Expr#first

Defined in:

lib/polars/expr.rb

#first ⇒ Expr

Get the first value.

Examples:

df = Polars::DataFrame.new({"a" => [1, 1, 2]})
df.select(Polars.col("a").first)
# =>
# shape: (1, 1)
# ┌─────┐
# │ a   │
# │ --- │
# │ i64 │
# ╞═════╡
# │ 1   │
# └─────┘

Returns:

• (Expr)

# File 'lib/polars/expr.rb', line 2301

def first
  _from_rbexpr(_rbexpr.first)
end