Jason Orendorff wrote:
To make this a little more concrete, just for fun...
Suppose I make an object representing "all future clicks" and give it
a map() method. This much, of course, is possible already:
var clicks = {
map: function (f) {
document.addEventListener("click", f);
}
};
With Mike's proposal, you could write:
for (let e of clicks) {
alert(e.clientX + ", " + e.clientY);
}
So, just to be clear, now the issue isn't that comprehensions make
arrays, it's that iteration isn't X. What is X? Quiz rule: don't say
"Monad" or "Monadic" in your answer. :-|
This would desugar to:
clicks.map(e => {
alert(e.clientX + ", " + e.clientY);
});
I don't see why for-of doing magic flatMap*;map is better than this.
And a listener would be attached to the document. The body of the loop
would run each time the user clicked.
That's just weird!
Iterators don't do this.
And rightly so!
/be
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