daft.functions.startswith#

def startswith(expr: Expression, prefix: str | Expression) -> Expression:
    """Checks whether each string starts with the given prefix in a string column.

    Args:
        expr: The expression to check.
        prefix: The prefix to search for as a literal string, or as a column to pick values from

    Returns:
        Expression: a Boolean expression indicating whether each value starts with the provided prefix

    Examples:
        >>> import daft
        >>> from daft.functions import startswith
        >>> df = daft.from_pydict({"x": ["geftdaft", "lazy", "daft.io"]})
        >>> df.with_column("match", startswith(df["x"], "daft")).collect()
        ╭──────────┬───────╮
        │ x        ┆ match │
        │ ---      ┆ ---   │
        │ String   ┆ Bool  │
        ╞══════════╪═══════╡
        │ geftdaft ┆ false │
        ├╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┤
        │ lazy     ┆ false │
        ├╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┤
        │ daft.io  ┆ true  │
        ╰──────────┴───────╯
        <BLANKLINE>
        (Showing first 3 of 3 rows)

    """
    return Expression._call_builtin_scalar_fn("starts_with", expr, prefix)