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was named one of the !

被评为 ！

In JavaScript, functions are first-class objects, which means they can be:

在JavaScript中，函数是一流的对象，这意味着它们可以是：

• stored in a variable, object, or array
  存储在变量，对象或数组中
• passed as an argument to a function
  作为参数传递给函数
• returned from a function
  从函数返回

存储功能 (Storing a function)

Functions can be stored in three ways:

函数可以通过三种方式存储：

• store in a variable : let fn = function doSomething() {}

  存储在变量中： let fn = function doSomething() {}

• store in an object : let obj = { doSomething : function(){} }

  存储在一个对象中： let obj = { doSomething : function(){} }

• store in an array : arr.push(function doSomething() {})

  存储在数组中： arr.push(function doSomething() {})

In the first and third example, I used a named function expression.

在第一个和第三个示例中，我使用了一个命名函数表达式。

The function expression defines a function as part of a larger expression. The line of code doesn’t start with function .

函数表达式将函数定义为较大表达式的一部分。 代码行不是以function开头的。

用作参数 (Function as an argument)

In the next example, the function doSomething is sent as an argument to doAction().

在下一个示例中，函数doSomething作为参数发送给doAction() 。

doAction(function doSomething(){});

doSomething is a callback.

doSomething是一个回调。

A callback is a function passed as an argument to another function.

回调是作为参数传递给另一个函数的函数。

高阶函数 (Higher order functions)

A higher order function is a function that takes another function as an input, returns a function or does both.

高阶函数是将另一个函数作为输入，返回一个函数或同时执行两个函数的函数。

You can find more in the book.

您可以在“ 一书中找到更多信息。

For more on applying functional programming techniques in React take a look at .

有关在React中应用函数式编程技术的更多信息，请查看 。

Learn functional React, in a project-based way, with .

通过 ，以基于项目的方式学习功能性React 。

翻译自:

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