`dataFrame.column.str — left()`

Description

The left() method of the str object returns the specified number of characters from the beginning of each value in the selected column.

Signature

dataFrame.column(columnName).str.left(count)

Scope: dataFrame
Family: str
Returns: array

Argument

columnName (string): The name of the column containing the values to extract.
count (number): The number of characters to extract from the beginning of each value.

Returns

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

Example

// extract values from a column of the dataFrame
var mask = dataFrame.column('values').str.left(10);

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