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Rediscovering JavaScript: ES6, ES7 & ES8

Solution Review: Fibonacci Series Index

Explore how to implement a Fibonacci series generator using ES6 features like iterators and symbols. Understand the step-by-step process of creating an infinite loop with generators that yield Fibonacci numbers and their indexes, enhancing your grasp of modern JavaScript concepts.

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Solution

The solution to the “Fibonacci Series Index” is given below.

Node.js
'use strict';
const fibonocciSeries = function*(limit) {
  let current = 0;
  let next = 1;
  let index = 0;
  yield *[[index++, current], [index++, next]];
  while(true) {
    const temp = current;
    current = next;
    next = next + temp;
    yield [index++, next]; 
    if (index > limit) break;
  }
}
console.log("For limit = 2");
for(const [index, value] of fibonocciSeries(2)) {
  process.stdout.write(value + ", ");
}
console.log('\n'+ "For limit = 4");
for(const [index, value] of fibonocciSeries(4)) {
  process.stdout.write(value + ", ");
}
console.log('\n'+ "For limit = 8");
for(const [index, value] of fibonocciSeries(8)) {
  process.stdout.write(value + ", ");
}
console.log('\n'+  "For limit = 12");
for(const [index, value] of fibonocciSeries(12)) {
  process.stdout.write(value + ", ");
}

Explanation

We need to implement an infinite loop in the generator function that will produce Fibonacci numbers until it reaches the specific condition and breaks the loop.

  • In the Fibonacci series, every subsequent number is the sum of the two previous numbers. So, first, we need to set two starting points, which are ...