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Firefox Generator/Iterator glossary

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Glossary

Iterator
Object with .next(), .send(obj) and .close() methods.

It is iterable via for...of and for...in loops. Both ways act the same, i.e. call .next() repeatedly until it throws a StopIteration.

Generator expression
Iterator created via e.g. (x*2 for (x of array)).

  • Can be assigned to a variable (⇒ Generator comprehension),
  • used in function call braces to create arguments (e.g. MyListClass(x for (x of myArray))),
  • or used with brackets instead of braces, which makes it an Array comprehension (e.g. var keys = [x for (x in myObject)])

Generator function
Iterator factory created via e.g. function g() { yield 1; yield 2 }.

A call to g() will return a new Iterator.

ECMA 6 Iterable
An object with an .iterator(…) method that returns a generator function. It is iterable via for...of.

JavaScript 1.7 Iterable
An object with an .__iterator__(…) method that returns a generator function. It is iterable via for...in.

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