Array Higher Order Functions in JavaScript

Hello Daniel,

The [JavaScript Array prototype](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/prototype) provides a number of what are fancily known as [higher-order functions](https://medium.com/humans-create-software/a-dirt-simple-introduction-to-higher-order-functions-in-javascript-b33bf9e19056). Apart from the usual suspects [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map), [Array.prototype.filter()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter) and [Array.prototype.reduce()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce), there are the lesser known [Array.prototype.sort()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort), [Array.prototype.some()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some) and [Array.prototype.every()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every) higher-order functions, not to mention [Array.prototype.forEach()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach) is also one. Having learnt these recently in JavaScript as well as Swift, I find them a very powerful tool to add in the toolbox of a programmer of any skill. They make array operations look significantly more structured in code. However, I do not know how efficient they are, when it comes to how fast one’s code runs.

I am raising this issue to request you to make a video tutorial on these higher-order functions, to reiterate, as knowing and using them are a powerful skill and they make your source code look far more structured and undeniably intuitive.

Sincerely,
Prathamesh Kowarkar

Inizia con i riferimenti MDN collegati su Array.prototype.map(), filter(), reduce(), sort(), some(), every() e forEach(). Un contributo completo consisterebbe in un video tutorial che tratti queste funzioni di ordine superiore, il loro utilizzo strutturato e la domanda dell’issue sull’efficienza a runtime.

Scritto dal modello di indicizzazione a partire dal testo della issue.