polars_core/series/ops/
extend.rs

1use crate::prelude::*;
2
3impl Series {
4    /// Extend with a constant value.
5    pub fn extend_constant(&self, value: AnyValue, n: usize) -> PolarsResult<Self> {
6        // TODO: Use `from_any_values_and_dtype` here instead of casting afterwards
7        let s = Series::from_any_values(PlSmallStr::EMPTY, &[value], true).unwrap();
8        let s = s.cast(self.dtype())?;
9        let to_append = s.new_from_index(0, n);
10
11        let mut out = self.clone();
12        out.append(&to_append)?;
13        Ok(out)
14    }
15}