/* jshint esnext: true */

function* helloWorldGenerator() {

yield 'hello';

yield 'world';

}

function* powersOfTwo(maxExponent) {

var exponent = 0;

while (exponent <= maxExponent) {

yield Math.pow(2, exponent);

exponent += 1;

}

}

// Generator objects have the following 4 (or 3) methods

// 1) next()

// 2) next(value) (send(value) in Python)

// 3) throw

// 4) close

// Generator objects no longer has a send(val) method, it is replaced by next(val)

// next is called to resume the generator, and next() is equal to calling next(null)

// throw makes the generator throw an exception

// close....

function* crazyGenerator(x) {

yield x + 1;

var y = yield null;

return x + y;

}

function* consumerGenerator(){

var i=0;

while (true) {

try {

var val = yield i++;

console.log('You "send" me the value: ', val);

} catch(e) {

console.log('You "threw" me an error, but I caught it...haha');

}

}

}

module.exports = {

helloWorldGenerator: helloWorldGenerator,

powersOfTwo: powersOfTwo,

crazyGenerator: crazyGenerator,

consumerGenerator: consumerGenerator

};