sane-generator
Why do I need Sane Generator?
In short, ECMAScript 6 Generators are closed if we break out of the loop which iterates them. I believe that this limits the Generators. For example, in Python, the following would work
>>> numbers = (num for num in range(10))
>>> for num in numbers:
... if num == 3:
... break
...
>>> next(numbers)
4This allows us partially consume the Generators whenever we want and that allows us to have elegant solutions like this one, by Jon Clements.
But the similar code in ECMAScript 6 would close the generator.
function* NumberGenerator() {
for (var i = 0; i < 10; i += 1) {
yield i;
}
}
var numbers = NumberGenerator();
for (var num of numbers) {
if (num === 3) {
break;
}
}
console.log(numbers.next());
// {"done": true}This module provides a way to overcome this feature.
I explained in detail in this blog post http://www.thefourtheye.in/2016/02/sane-ecmascript-6-generators.html.
Installation
npm install sane-generator
Usage
var SaneGenerator = require('sane-generator');
function* NumberGenerator() {
for (var i = 0; i < 10; i += 1) {
yield i;
}
}
var numbers = SaneGenerator(NumberGenerator());
for (var num of numbers) {
if (num === 3) {
break;
}
}
console.log(numbers.next());
// {"value": 4, "done": false}How to explicitly close the SaneGenerator?
var SaneGenerator = require('sane-generator');
function* NumberGenerator() {
for (var i = 0; i < 10; i += 1) {
yield i;
}
}
var numbers = SaneGenerator(NumberGenerator());
console.log(numbers.next());
// {"value": 0, "done": false}
console.log(numbers.next());
// {"value": 1, "done": false}
console.log(numbers.return(undefined)); // call `return` with any value
// {"done": true}
console.log(numbers.next());
// {"value": undefined, "done": true}
