Method: Polars::StringExpr#to_lowercase

Defined in:

lib/polars/string_expr.rb

#to_lowercase ⇒ Expr

Transform to lowercase variant.

Examples:

df = Polars::DataFrame.new({"foo" => ["CAT", "DOG"]})
df.select(Polars.col("foo").str.to_lowercase)
# =>
# shape: (2, 1)
# ┌─────┐
# │ foo │
# │ --- │
# │ str │
# ╞═════╡
# │ cat │
# │ dog │
# └─────┘

Returns:

• (Expr)

# File 'lib/polars/string_expr.rb', line 400

def to_lowercase
  Utils.wrap_expr(_rbexpr.str_to_lowercase)
end