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CHALLENGE class Range { constructor(start, end, step = 1) { this.start = start; this.end = end; this.step = step; } [Symbol.iterator]() { let current = this.start; const { end, step } = this; return { next() { if (current <= end) { const value = current; current += step; return { value, done: false }; } return { value: undefined, done: true }; } }; } } const range = new Range(1, 10, 3); const result = [...range].map(n => n ** 2); console.log(result);

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