`dataFrame.column.str — prefixAdd()`

Description

The prefixAdd() method of the str object returns the values of the selected column with the specified prefix added.

Signature

dataFrame.column(columnName).str.prefixAdd(prefix)

Scope: dataFrame
Family: str
Returns: array

Argument

columnName (string): The name of the column containing the values to transform.
prefix (string): The prefix to add to each value.

Returns

mask ( string[] ): An array containing the transformed values.

Example

// add a prefix to the values of a column of the dataFrame
var mask = dataFrame.column('values').str.prefixAdd('prefix_');

// add values to the dataFrame
dataFrame.column('newValues').set(mask);