fibonacci - generators

fibonacci-generators-es2015.js

function *fibonacci() {  
    let [prev, current] = [0, 1];
    while(true) { 
        [prev, current] = [current, prev + current]; 
        yield current; 
    }
}

let seq = fibonacci();  

let arrayFib = [];
for (num of seq) {
	if (num > 1000) break;
	arrayFib.push(num)
}
console.log (arrayFib.join(" - "))