Quick review (consult “Speaking JavaScript” for more information): Expressions produce (are evaluated to) values.
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Keep in mind that returning object literals using the concise body syntax params => {object:literal} will not work as expected. Would you like to stay up to date about new content? Now we have learned the basic syntax of the arrow function and saw some of its use cases. A value to be passed to the function to be used as its "this" value. Not fun. In a block body, you must use an explicit return statement. Examples: Most expressions1 can be used as statements, simply by mentioning them in statement positions: If an expression is the body of an arrow function, you don’t need braces: However, statements have to be put in braces: Some parts of JavaScript’s syntax are ambiguous. The HTMLCol… As aforementioned, just summing up, there are some situations you should not use arrow functions: Use arrow functions for all other occasions if you prefer. If you read them, you’ll note that they don’t say anything about using the getElementsByClassName() method or the HTMLCollection interface in for loops. Twitter — That is, they are different from normal functions (you could even say that they do less). ECMAScript 6 solution: arrow functions, 13.3.1. In strict mode, this is undefined in non-method functions, which is why we get an error if we use Prefixer: There are three ways to work around this problem in ECMAScript 5. In general, with regular functions, we always have to keep track of the “this” context and remember to bind it correctly, the problem would be cumbersome when we have multiple nested functions. Traditional functions are bad non-method functions, due to, consult “Speaking JavaScript” for more information, Immediately Invoked Function Expressions (IIFEs), A section in the chapter on callable entities, 13.2.2. It's important to note that you're not allowed to modify variables from the outer scope. GitHub. Even though map() is a function of Array.prototype, it works on any array-like iterable. ECMAScript 5.1 added a few very useful ones. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning, testing, and training. So while searching for this which is not present in the current scope, an arrow function ends up finding the this from its enclosing scope. The HTMLCollection doc does, however reference the NodeList doc, which does mention iteration: Don’t be tempted to use for…in or for each…in to enumerate the items in the list, since that will also enumerate the length and item properties of the NodeList and cause errors if your script assumes it only has to deal with element objects. We’re learning!” Also, there’s actually a good reason not to convert it to an array which I will get to later.
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