What does asterisk curly brace *{ mean when defining objects in javascript

Question

For example:

projection = *{
  var projection = d3.geoOrthographic();
  while (true) {
    yield projection.rotate([Date.now() / 200, -20]);
  }
}

I have seen this in this tutorial https://medium.com/@mbostock/a-better-way-to-code-2b1d2876a3a0

but it only runs for me if I use it without the asterisk "*"

projection = {
  var projection = d3.geoOrthographic();
  while (true) {
    yield projection.rotate([Date.now() / 200, -20]);
  }
}

What does the asterisk mean in this context for javascript?

Answer 1

Similar to python, the function * declares a generator function (notice the use of the keyword yield also). ~~This is suggested in ES5~~

Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*