The yield* keyword inside a generator function takes an iterable object as the expression and iterates it to yield its values. Here is an example to demonstrate this:
function* generator_function_1(){ yield 2; yield 3;}function* generator_function_2(){ yield 1; yield* generator_function_1(); yield* [4, 5];}const generator = generator_function_2();console.log(generator.next().value);console.log(generator.next().value);console.log(generator.next().value);console.log(generator.next().value);console.log(generator.next().value);console.log(generator.next().done);
The output is as follows:
12345true
