Method: Polars::StringExpr#len_chars

Defined in:
lib/polars/string_expr.rb

#len_chars ⇒ Expr Also known as: n_chars

Note:

If you know that you are working with ASCII text, lengths will be equivalent, and faster (returns length in terms of the number of bytes).

Get length of the strings as :u32 (as number of chars).

Examples:

df = Polars::DataFrame.new({"s" => ["Café", nil, "345", "東京"]}).with_columns(
  [
    Polars.col("s").str.len_bytes.alias("length"),
    Polars.col("s").str.len_chars.alias("nchars")
  ]
)
df
# =>
# shape: (4, 3)
# ┌──────┬────────┬────────┐
# │ s    ┆ length ┆ nchars │
# │ ---  ┆ ---    ┆ ---    │
# │ str  ┆ u32    ┆ u32    │
# ╞══════╪════════╪════════╡
# │ Café ┆ 5      ┆ 4      │
# │ null ┆ null   ┆ null   │
# │ 345  ┆ 3      ┆ 3      │
# │ 東京 ┆ 6      ┆ 2      │
# └──────┴────────┴────────┘

Returns:

[View source]

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# File 'lib/polars/string_expr.rb', line 318

def len_chars
  Utils.wrap_expr(_rbexpr.str_len_chars)
end