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Generator.prototype.throw() - JavaScript | MDN
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Generator.prototype.throw()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2016 9.

throw() throw .

In this article

js
generatorObject.throw(exception);

exception

. Error (instanceof Error) .

try...catch yield .

done

.

  • true.
  • false.
value

yield .

try...catch throw() exception .

throw() , throw exception; . exception throw() . throw(exception) throw. yield try...catch , .

throw()

throw . try...catch .

js
function* gen() {
  while (true) {
    try {
      yield 42;
    } catch (e) {
      console.log("Error caught!");
    }
  }
}

const g = gen();
g.next();
// { value: 42, done: false }
g.throw(new Error("Something went wrong"));
// "Error caught!"
// { value: 42, done: false }

Specification
ECMAScript 2027 LanguageSpecification
# sec-generator.prototype.throw

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  2. Generator
    1. Generator.prototype.next()
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  5. Iterator
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  9. Object/Function
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