January 2017
Beginner to intermediate
550 pages
10h 6m
English
Content preview from Object-Oriented JavaScript - Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Lexical this in arrow functions
We discussed ES6 arrow functions and the syntax in detail in the last chapter. However, an important aspect of arrow functions is that they behave differently from normal functions. The difference is subtle but important. Arrow functions do not have their own value of this. The value of this in an arrow function is inherited from the enclosing (lexical) scope.
Functions have a special variable this that refers to the object via which the method was invoked. As the value of this is dynamically given based on the function invocation, it is sometimes called dynamic this. A function is executed in two scopes-lexical and dynamic. A lexical scope is a scope that surrounds the function scope, and the dynamic scope is the ...
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