Implement a custom iterator in JavaScript that iterates over Fibonacci numbers.
Instruction: Write a custom iterator that generates an infinite sequence of Fibonacci numbers.
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Absolutely, I'd be happy to dive into that. Firstly, to clarify, the Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, usually starting with 0 and 1. In implementing a custom iterator for this sequence, we're essentially creating an object that adheres to the JavaScript iterator protocol. This protocol requires the object to have a next() method that returns an object with two properties: value, the next Fibonacci number in the sequence, and done, a boolean indicating if the iteration is complete. Given the infinite nature of Fibonacci numbers, done will perpetually be false in our case.
const fibonacciIterator = { [Symbol.iterator]() { let [prev, curr] = [0, 1]; return { next() { [prev, curr]...