Dynamics 365 - How to Get Selected Count of Multi-Select Picklist

Lets take an example of a multi-select picklist having 5 values: 

1. Banana
2. Orange
3. Strawberry
4. Guava 
5. Grapes

While working on the form, if a user selects only 2 out of these, e.g: 

1. Banana
2. Guava

Following JavaScript will return the count of selected values in the multi-select picklist i.e. 2. 

function GetMultiSelectPicklistLength(executionContext)

{

var length = 0;

var formContext = executionContext.getFormContext();

var multiSelectField = formContext.getAttribute("new_MultiselectPicklist");

if(multiSelectField != null)

{

var fieldValue = multiSelectField.getText();

if(fieldValue != null)

{

lengthValue = fieldValue.length;

}

}

return length;

}