Spread parameters

[vjau]

In the book, this code is demonstrated :

function foo(x, y, z) { }
var args = [0, 1, 2];
foo(...args);

This is perfectly valid ES6 code, however AFAIK the TS compiler reports an error per microsoft/TypeScript#5296

[basarat]

It compiles to valid JavaScript, but still reports an error. I might not have run this code sample and assumed it would work based on microsoft/TypeScript#1931 (comment).

I'll fix the docs when I have some time 🌹

[amoskyler]

Oh great, I should have looked through the issues! I left a comment on the gitbooks page earlier last week.

So this compiles correctly, but it's unsupported in ts? I'm imagining that means it just shouldn't be used until it's supported in the ts compiler.

[Kyry11]

It looks like the only way to use Spread Op in the function call is to have a matching Rest Op in the function declaration. Hopefully, in the future TS will be able to type check spread properly.
I look forward to spreading Tuples into function params 😄