What is a descriptor? [closed]

Answer 1

A property descriptor can be of two types: data descriptor, or accessor descriptor.

Data descriptor

Mandatory properties:

• value

Optional properties:

• configurable
• enumerable
• writable

Sample:

{
    value: 5,
    writable: true
}

Accessor descriptor

Mandatory properties:

• Either get or set or both

Optional properties:

• configurable
• enumerable

Sample:

{
    get: function () {
        return 5;
    },
    enumerable: true
}

Answer 2

A descriptor is something that describes something. In this case it's just a plain object ({...}) with certain fields, that describes how the property should behave. Read further down the page to see what fields you can use.