Keyword Analysis & Research: js arrow function scope


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Frequently Asked Questions

What are arrow functions in JavaScript?

The 2015 edition of the ECMAScript specification (ES6) added arrow function expressions to the JavaScript language. Arrow functions are a new way to write anonymous function expressions, and are similar to lambda functions in some other programming languages, such as Python.

Where does the arrow point in the enclosing scope?

Short answer: this points at the nearest bound this - in the code provided this is found in the enclosing scope. Longer answer: Arrow functions do not have this, arguments or other special names bound at all - when the object is being created the name this is found in the enclosing scope, not the person object.

Why are arrow functions not effective as object methods?

While arrow functions are excellent as parameter functions passed into array methods, they are not effective as object methods because of the way they use lexical scoping for this. Using the same example as before, take the loop method and turn it into an arrow function to discover how it will execute:

Are arrow functions async?

Rest parameters, default parameters, and destructuring within params are supported, and always require parentheses: Arrow functions can be async by prefixing the expression with the async keyword. Let's decompose a traditional anonymous function down to the simplest arrow function step-by-step. Each step along the way is a valid arrow function.


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