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Executing constructor in class from module doesn't pass arguments #1601

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gfwilliams opened this issue Jan 21, 2019 · 1 comment
Closed

Executing constructor in class from module doesn't pass arguments #1601

gfwilliams opened this issue Jan 21, 2019 · 1 comment

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@gfwilliams
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gfwilliams commented Jan 21, 2019 •
edited 

Modules.addCached("mod",`
class b {
  constructor(a) {
    console.log("Argument",a);
    if (a!="Foo") throw "No argument passed!";
  }
}
exports = b;`);

mB = new (require('mod'))("Foo");

Fails, but

class b {
  constructor(a) {
    console.log("Argument",a);
    if (a!="Foo") throw "No argument passed!";
  }
}

mB = new b("Foo");

works, as does:

Modules.addCached("mod",`
function b(a) {
  console.log("Argument",a);
  if (a!="Foo") throw "No argument passed!";
}
exports = b;`);

mB = new (require('mod'))("Foo");

http://forum.espruino.com/conversations/329854/#comment14581420

This worked in 2v00
@gfwilliams
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Ok, comparing traces of the object it seems this is because in a class the scope gets moved to the front of the function (before parameters), when the order actually matters during execution.

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