javascript “let”变量在编程中的语言意义
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Linguistic meaning of 'let' variable in programming
提问by ngstschr
So, I'm a javascript programmer and the new version of JavaScript (ES6)has a new keyword for declaring variables: let, next to the old one var.
所以，我是一名 javascript 程序员，新版本的JavaScript (ES6)有一个用于声明变量的新关键字：let, 在旧的旁边var。
I know the difference between these two, but I was asking myself: what does letstand for? varobviously is an abbreviation of "variable", but let? Is it an abbreviation as well? Where does it come from?
我知道这两者之间的区别，但我问自己：代表什么let？var显然是“ variable”的缩写，但是let？也是缩写吗？它从何而来？
I googled this and to my amazement, I couldn't find an answer. I already knew Swiftalso has a letkeyword (they use it for constants), but apparently some other programming languages use it as well.
我用谷歌搜索了这个，令我惊讶的是，我找不到答案。我已经知道Swift也有一个let关键字（他们将它用于常量），但显然其他一些编程语言也使用它。
回答by azium
It comes from the English word 'let'.
它来自英文单词“let”。
verb: "let", "letting". 1. to allow or permit:
动词：“让”，“让”。1. 允许或许可：
// Hey computer, can you please
let
// this
night = 'wonderful'
Lisphas the keyword letand it's been around since 1958, though it may have come from even earlier.
