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How do generators work in JavaScript?

Asked on Jul 16, 2025

Answer

Generators in JavaScript are special functions that can be paused and resumed, allowing you to iterate over a sequence of values. They are defined using the "function*" syntax and use the "yield" keyword to produce values.

// Define a generator function
        function* simpleGenerator() {
            yield 1;
            yield 2;
            yield 3;
        }

        // Create an iterator from the generator
        const iterator = simpleGenerator();

        console.log(iterator.next().value); // Output: 1
        console.log(iterator.next().value); // Output: 2
        console.log(iterator.next().value); // Output: 3
        console.log(iterator.next().done);  // Output: true

Additional Comment:

Generators are defined with the "function*" syntax.
Use "yield" to pause the function and return a value.
The "next()" method resumes the generator and returns an object with "value" and "done" properties.
Generators are useful for creating iterators and handling asynchronous operations.

✅ Answered with JavaScript best practices.

Ask any question about JavaScript here... and get an instant response.

How do generators work in JavaScript?

Asked on Jul 16, 2025

Answer

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