javascript - <| 是什么意思？这段代码的意思是？

Question

function foo() {}
var bar = foo <| function() {};

我还是第一次见到这样的事情。 <| 是什么意思？意思是？

来源:https://github.com/allenwb/ESnext-experiments/blob/master/ST80collections-exp1.js

Answer 1

现在您已经发布了源链接，您可以在文件顶部的注释中准确地看到它的作用 ( line 36 ):

the <| operator -- defines the [[Prototype]] of a literal...

For these examples <| used with a function expression sets the [[Prototype]] of the object created as the value of the function's "prototype" property to the value of the "prototype" property of the the LHS object. This is in addition to setting the [[Prototype]] of the function object itself. In other words, it builds sets the [[Prototype]] of both the function and of function.prototype to potentially different values.

更新:当我遇到 full ECMAScript Harmony proposal for this "literal [[Prototype]] operator" 时，我才想起这个问题。 。其中的信息比上面引用的信息多得多，因此值得一读。