Chapter 4

Here are the solutions to the Exercises, for the Chapter 4, Iterators and Symbols chapter.

	const letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];

	for(const [i, letter] of letters.entries()) {
	if(i % 3 === 0)
	console.log(letter);
	}

	const numbers = [1, 2, 3];

	console.log("The Symbol properties in arrays are:");

	console.log(
	Object.getOwnPropertySymbols(Object.getPrototypeOf(numbers)));

	class Message {
	constructor(text) { this.text = text; }

	[Symbol.replace](word, substitute) {
	return this.text.replace(word, substitute);
	}
	}

	const message = new Message('There are no stupid questions.');

	console.log('stupid'.replace(message, 's***'));
	//There are no s**** questions.*

	console.log(''.replace(message, 'Yes, '));
	//Yes, There are no stupid questions.

	const fibonocciSeries = function*() {
	let current = 1;
	let next = 1;

	yield* [current, next];

	while(true) {
	const temp = current;
	current = next;
	next = next + temp;

	yield next;
	}
	}

	for(const value of fibonocciSeries()) {
	if(value > 25) break;
	process.stdout.write(value + ", ");
	}

	const fibonocciSeries = function*() {
	let current = 1;
	let next = 1;

	let index = 0;

	yield *[[index++, current], [index++, next]];

	while(true) {
	const temp = current;
	current = next;
	next = next + temp;

	yield [index++, next];
	}
	}

	for(const [index, value] of fibonocciSeries()) {
	if(index > 8) break;
	process.stdout.write(value + ", ");
	}

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Table of Contents for Chapter 4