Contents

mapMissing(_:)

Creates a new column of typed values by applying the given thread-safe transform to every element of this untyped column, including missing elements.

Declaration

func mapMissing<T>(_ lazyTransform: @escaping (MLDataValue) -> T?) -> MLDataColumn<T> where T : MLDataValueConvertible

Parameters

  • lazyTransform:

    A thread-safe element transformation function. The implementation of the transform you provide should accept an element of the column and return a transformed value of a type that conforms to Mldatavalueconvertible. If the transform returns nil for a given element, the corresponding element in the new column will have a missing value.

Return Value

A new MLDataColumn column.

See Also

Transforming elements to generate a data column