Arrow function vs function declaration / expressions: Are they equivalent / exchangeable? No! Arrow functions and function declarations / expressions are not equivalent and cannot be replaced blindly.

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If the function you want to replace does not use this, arguments and is not called with new, then yes. As so often: it depends. Arrow functions have different behavior than function declarations / expressions, so lets have a look at the differences first: 1. Lexical this and arguments. Arrow functions don't have their own this or arguments binding.

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Instead, those identifiers are resolved in the lexical scope like any other variable. That means that inside an arrow function, this and arguments refer to the values of this and arguments in the environment the arrow function is defined in (i. Example using a function expression. Object() {. console. Inside `create. Object`: ', this.

Inside `bar`: ', this. Object. call({foo: 2.

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Object// Example using a arrow function. Object() {. console. Inside `create. Object`: ', this. Inside `bar`: ', this. Object. call({foo: 2. Object. In the function expression case, this refers to the object that was created inside the create.

Object. In the arrow function case, this refers to this of create. Object itself. This makes arrow functions useful if you need to access the this of the current environment: // currently common pattern. Data(function(data) {. Data(data => {. Note that this also means that is not possible to set an arrow function's this with . If you are not very familiar with this, consider reading 2.

Arrow functions cannot be called with new. ES2. 01. 5 distinguishes between functions that are callable and functions that are constructable.

If a function is constructable, it can be called with new, i. User(). If a function is callable, it can be called without new (i. Functions created through function declarations / expressions are both constructable and callable.

Arrow functions (and methods) are only callable. If you are trying to call a non- callable function or to construct a non- constructable function, you will get a runtime error. Knowing this, we can state the following. Replaceable: Functions that don't use this or arguments. Functions that are used with .

Not replaceable: Constructor functions. Function / methods added to a prototype (because they usually use this)Variadic functions (if they use arguments (see below))Lets have a closer look at this using your examples: Constructor function. This won't work because arrow functions cannot be called with new. Keep using a function declaration / expression or use class. Prototype methods. Most likely not, because prototype methods usually use this to access the instance.

If they don't use this, then you can replace it. However, if you primarily care for concise syntax, use class with its concise method syntax: class User {. Object methods. Similarly for methods in an object literal. If the method wants to reference the object itself via this, keep using function expressions, or use the new method syntax: const obj = {.

Callbacks. It depends. You should definitely replace it if you you are aliasing the outer this or are using . Timeout(function() {. Timeout(() => {. But: If the code which calls the callback explicitly sets this to a specific value, as is often the case with event handlers, especially with j.

Query, and the callback uses this (or arguments), you cannot use an arrow function! Variadic functions. Watch Suing The Devil Online Freeform more. Since arrow functions don't have their own arguments, you cannot simply replace them with an arrow function. However, ES2. 01. Related question: Further resources.

Gotham Explains Bruce's Proto- Batman Costume. A teaser clip for Gotham season 4, episode 2 explains Bruce Wayne’s decision to suit up in a proto- Batman costume so early in his crime- fighting career. David Mazouz’s Bruce has been seen in the costume in various promotional materials for Gotham season 4, including the extended trailer that arrived earlier this month.

The introduction of this eye- catching costume has caused fans to ask a big question: will Bruce properly become Batman this year? There are plenty of other questions on the minds of Gotham fans, as well. Everyone has been left to wonder both why Erin Richards’ Barbara was absent from the Gotham season 4 premiere and when Robin Lord Taylor’s Penguin will unfreeze Cory Michael Smith’s Riddler this season. Fans have been given an answer to one burning question, though: no, Jada Pinkett Smith’s Fish Mooney will not return in Gotham season 4.

Now, thanks to this new clip, an answer has also been provided with regards to Bruce’s motivations for donning a cowl at this particular point in his journey towards heroism. Judging by this preview video, it sounds like Bruce has opted to suit up for safety reasons.“The whole uniform is extremely lightweight, and actually bulletproof”, Chris Chalk’s Lucius Fox explains, giving fans some insight into the specifications and capabilities of Bruce’s new threads. Bruce responds with a wry delivery of the words “I feel safer already”, which explains his motivations for donning this new suit: his homemade outfit from season 4, episode 1 wasn’t exactly the pinnacle of safety wear, which has inspired Bruce to seek Lucius’ help. The new costume has received a lot of criticism, but it’s hard to deny how enjoyable it is, three years after Gotham premiered, to see Bruce properly fighting crime. Also, it’s important to understand that this is an early prototype – it’s surely the first of many costumes that Lucius will make for Bruce. This isn’t intended to be the finished product. This version of the Batsuit only exists to keep Bruce safe while he learns the ropes of vigilantism.

The iconic design flourishes associated with Batman will surely follow in due course, as Bruce develops his crime- fighting persona and learns the importance of theatricality from Ra’s al Ghul and the League of Shadows. For now, the suit is just for safety, but Bruce will surely learn, in time, that it has a large role to play: striking fear into the hearts of criminals. Gotham season 4 continues next Thursday with ‘The Fear Reaper’ @8pm on FOX.