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addPropPercentage(data, prop, propName = prop + "Percentage")

Calculates the percentage of a numeric object property prop to the total for this property of all data objects. The percentage is stored in the object as a new property propName with a value from 0 to 1.

Example:

If you have data like this representing a superhero family's weekend activity:

let rescuedPeople = [
  {Name: "Superboy", rescued: 5},
  {Name: "Supergirl", rescued: 8},
  {Name: "Superman", rescued: 3},
  {Name: "Superwoman", rescued: 4}
]

This calculates the percentage of rescued people that each superhero contributed to the family's total count (which is 20):

let rescuedPeople = gmynd.addPropPercentage(rescuedPeople, "rescued");

This is the result:

[
  {Name: "Superboy", rescued: 5, rescuedPercentage: 0.25},
  {Name: "Supergirl", rescued: 8, rescuedPercentage: 0.4},
  {Name: "Superman", rescued: 3, rescuedPercentage: 0.15},
  {Name: "Superwoman", rescued: 4, rescuedPercentage: 0.2}
]