Contents

prototype

A prototype that creates type-erased columns with the same underlying type as the column slice.

Declaration

var prototype: any AnyColumnPrototype { get }

Discussion

Use a type-erased column prototype to create new columns of the same type as the slice’s parent column without explicitly knowing what type it is, by calling the prototype property’s makeColumn(capacity:) method.

// Get a type-erased column.
let someColumn: AnyColumn = dataFrame["someFeature"]

// Create a new column with the same type.
let newColumn = someColumn.prototype.makeColumn(capacity: 10)