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Ilya Kantor 2018-02-06 13:07:22 +03:00
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When a function solves a task, in the process it can call many other functions. A partial case of this is when a function calls *itself*. That's called *recursion*.
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## Two ways of thinking
For something simple to start with -- let's write a function `pow(x, n)` that raises `x` to a natural power of `n`. In other words, multiplies `x` by itself `n` times.

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In this chapter we'll learn how to do the same. And, more importantly, how to feel comfortable working with such functions and arrays.
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## Rest parameters `...`
A function can be called with any number of arguments, no matter how it is defined.

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Different languages behave differently here, and in this chapter we cover the behaviour of JavaScript.
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## A couple of questions
Let's consider two situations to begin with, and then study the internal mechanics piece-by-piece, so that you'll be able to answer the following questions and more complex ones in the future.

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If you don't plan meeting such scripts you may even skip this chapter or postpone it, but then there's a chance that it bites you later.
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From the first sight, `var` behaves similar to `let`. That is, declares a variable:
```js run

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There's one more way to create a function. It's rarely used, but sometimes there's no alternative.
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## Syntax
The syntax for creating a function:

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These methods are not a part of JavaScript specification. But most environments have the internal scheduler and provide these methods. In particular, they are supported in all browsers and Node.JS.
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## setTimeout
The syntax:

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JavaScript gives exceptional flexibility when dealing with functions. They can be passed around, used as objects, and now we'll see how to *forward* calls between them and *decorate* them.
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## Transparent caching
Let's say we have a function `slow(x)` which is CPU-heavy, but its results are stable. In other words, for the same `x` it always returns the same result.

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Suddenly, `this` just stops working right. The situation is typical for novice developers, but happens with experienced ones as well.
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## Losing "this"
We already know that in JavaScript it's easy to lose `this`. Once a method is passed somewhere separately from the object -- `this` is lost.

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We can bind not only `this`, but also arguments. That's rarely done, but sometimes can be handy.
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The full syntax of `bind`:
```js

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Let's revisit arrow functions.
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Arrow functions are not just a "shorthand" for writing small stuff.
JavaScript is full of situations where we need to write a small function, that's executed somewhere else.