`dataFrame.column.compare — startsWith()`

Description

The startsWith() method of the compare object returns a boolean mask indicating which values start with the specified string.

Signature

dataFrame.column(columnName).compare.startsWith(string)

Scope: column
Family: compare
Returns: mask

Arguments

columnName (string): The name of the column to compare values from.
string (string): The string to match at the start of each value.

Returns

mask ( boolean[] )

A boolean mask indicating the rows whose values start with the specified string.

Starts with the string: 1
Otherwise: 0

Example

// higlight rows where value starts with 'b' in the column 'pet'
var mask = df.column('pet').compare.startsWith('b');

// set mask to dataFrame
df.column('pet_b').set(mask)