reactjs - React propTypes: objectOf vs shape?

Question

What's the difference between PropTypes.objectOf and PropTypes.shape? In the PropTypes:

// An object with property values of a certain type
optionalObjectOf: PropTypes.objectOf(PropTypes.number)

vs

// An object taking on a particular shape
optionalObjectWithShape: PropTypes.shape({
  color: PropTypes.string,
  fontSize: PropTypes.number
})

When should I use objectOf and when should I use shape?

Answer 1

PropTypes.objectOf is used when describing an object whose properties are all the same type.

    const objectOfProp = {
        latitude: 37.331706,
        longitude: -122.030783
    }
    // PropTypes.objectOf(PropTypes.number)

PropTypes.shape is used when describing an object whose keys are known ahead of time, and may represent different types.

    const shapeProp = {
        name: 'Jane',
        age: 25
    }
    // PropTypes.shape({ name: PropTypes.string, age: PropTypes.number })