Method: Polars::StringExpr#slice

Defined in:
lib/polars/string_expr.rb

#slice(offset, length = nil) ⇒ Expr

Create subslices of the string values of a Utf8 Series.

Examples:

df = Polars::DataFrame.new({"s" => ["pear", nil, "papaya", "dragonfruit"]})
df.with_column(
  Polars.col("s").str.slice(-3).alias("s_sliced")
)
# =>
# shape: (4, 2)
# ┌─────────────┬──────────┐
# │ s           ┆ s_sliced │
# │ ---         ┆ ---      │
# │ str         ┆ str      │
# ╞═════════════╪══════════╡
# │ pear        ┆ ear      │
# │ null        ┆ null     │
# │ papaya      ┆ aya      │
# │ dragonfruit ┆ uit      │
# └─────────────┴──────────┘

Parameters:

  • offset (Integer) —

    Start index. Negative indexing is supported.

  • length (Integer) (defaults to: nil) —

    Length of the slice. If set to nil (default), the slice is taken to the end of the string.

Returns:


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# File 'lib/polars/string_expr.rb', line 1283

def slice(offset, length = nil)
  offset = Utils.parse_into_expression(offset)
  length = Utils.parse_into_expression(length)
  Utils.wrap_expr(_rbexpr.str_slice(offset, length))
end