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第五章 可组合性 第二个代码块前面的那句话：

举个例子,我们编写一段代码,找出数据集中男人和女人的平均年龄。

原文是活着和死亡语言的平均年龄：

As an example, let’s write code that finds the average year of origin for living
and dead scripts in the data set.

位置 :
一、值，类型和运算符
自动类型转换
错误内容 :
"字符串和数字转换为布尔值的规则表明，0，NaN和空字符串（""）计为false，而其他所有值都计为true。"

原作中没有这一句 , 而且这句是错的 . NaN == false返回的是false .

Functions as values
A function binding usually simply acts as a name for a specific piece of the program. Such a binding is defined once and never changed. This makes it easy to confuse the function and its name.

But the two are different. A function value can do all the things that other values can do—you can use it in arbitrary expressions, not just call it. It is possible to store a function value in a new binding, pass it as an argument to a function, and so on. Similarly, a binding that holds a function is still just a regular binding and can, if not constant, be assigned a new value, like so:

https://github.com/wizardforcel/eloquent-js-3e-zh/blob/master/4.md#%E5%AF%B9%E8%B1%A1

似乎readme.md的链接失效了