Method from_unary

arrow-array/src/array/primitive_array.rs:1099–1109

Applies a unary infallible function to each value in an array, producing a new primitive array. # Null Handling See [`Self::unary`] for more information on null handling. # Example: create an [`Int16Array`] from an [`ArrayAccessor`] with item type `&[u8]` ``` use arrow_array::{Array, FixedSizeBinaryArray, Int16Array}; let input_arg = vec![ vec![1, 0], vec![2, 0], vec![3, 0] ]; let arr = FixedSi

(left: U, mut op: F)

    /// assert_eq!(c, Int16Array::from(vec![Some(1i16), Some(2i16), Some(3i16)]));
    /// ```
    pub fn from_unary<U: ArrayAccessor, F>(left: U, mut op: F) -> Self
    where
        F: FnMut(U::Item) -> T::Native,
    {
        let nulls = left.logical_nulls();
        let buffer: Vec<_> = (0..left.len())
            // SAFETY: i in range 0..left.len()
            .map(|i| op(unsafe { left.value_unchecked(i) }))
            .collect();
        PrimitiveArray::new(buffer.into(), nulls)
    }

    /// Returns a `PrimitiveBuilder` for this array, suitable for mutating values
    /// in place.