January 2019
Beginner
210 pages
4h 47m
English
Content preview from Hands-On Functional Programming with TypeScript
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Accessing the prototype of an object
Prototypes can be accessed in three different ways:
- Person.prototype
- Object.getPrototypeOf(person)
- person.__proto__
The use of __proto__ is controversial and has been discouraged by many experienced software engineers. It was never originally included in the ECMAScript language specification, but modern browsers decided to implement it in any case. Today, the __proto__ property has been standardized in the ECMAScript 6 language specification and will be supported in future, but it is still a slow operation that should be avoided if performance is a concern.
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