On: How JavaScript Works: deep dive into call, apply, ...

[nicoburns]

You could do it like this:

    const mapNodeList = (...nodeList) => nodeList.map(myFn);
    mapNodeList(...$nodeList)

[kevincox → nicoburns]

Or simply [...nodeList].map()

[moron4hire → kevincox]

I don't think you can use splats with a NodeList. At least, the TypeScript compiler complains about it.

[webstrand → moron4hire]

`[ ...document.body.childNodes ]` is legal. You need to have the `DOM.Iterable` enabled in your compilerOptions.libs` for TypeScript to permit it, though.

[edflsafoiewq → moron4hire]

Works for me. Splats work for any iterable.

[hajile → nicoburns]

That creates an entire extra list of garbage.

[lhorie → hajile]

    const mapNodeList = (...nodeList) => nodeList.map(myFn);
    mapNodeList(...$nodeList)

Garbage collection really isn't the biggest of concerns here considering this code is susceptible to a stack overflow...

[chrisseaton → hajile]

Doesn’t the compiler optimise it away?

[hajile → chrisseaton]

Those aren't the same types. One is a DOM array and the other is a JS array. They don't share the same constructor or the same prototype chain.