Iterators & Generators in depth

Iterators & Generators in depth

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators

const arr = [11,12,13];
// (3) [11, 12, 13]

const itr = arr[Symbol.iterator]();
// Array Iterator {}

itr.next();
{value: 11, done: false}

itr.next(); 
{value: 12, done: false}

itr.next(); 
{value: 13, done: false}

itr.next();
{value: undefined, done: true}

Symbol.iterator;
// Symbol(Symbol.iterator)

function *infiniteNumbers() {
  var n = 1;
  while (n < 3){
    yield n++;
  }
}

const numbers = infiniteNumbers()
// infiniteNumbers {<suspended>}

numbers.next();
{value: 1, done: false}

numbers.next();
{value: 2, done: false}

numbers.next();
{value: undefined, done: true}

Iterators

迭代器

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols

Generators

生成器

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Generator

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/yield

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/yield*

for of

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of

for, for...in, for...of, foeEach, map, filter, reduce, ...

refs

https://www.barretlee.com/blog/2016/07/09/a-kickstarter-guide-to-writing-es6/

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