Old school D3 from simpler times

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aciurea

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JS Bin // source http://jsbin.com/ruxuhil

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
const fibonnaci = {
   [Symbol.iterator](){
         let num1 = 1, num2 = 1;
    return {
       [Symbol.iterator](){return this;},
       next(){
        let current = num2;
        num2 = num1;
        num1 += current;
      return {value: num1, done: false};
    },
   return(v){ 
      console.log('finished---');
      return{value:v, done:true};}
      
    }
  }
}

console.log(1);

for(var a of fibonnaci){
  console.log(a);
if(a>50)break;
}
</script>

<script id="jsbin-source-javascript" type="text/javascript">const fibonnaci = {
   [Symbol.iterator](){
         let num1 = 1, num2 = 1;
    return {
       [Symbol.iterator](){return this;},
       next(){
        let current = num2;
        num2 = num1;
        num1 += current;
      return {value: num1, done: false};
    },
   return(v){ 
      console.log('finished---');
      return{value:v, done:true};}
      
    }
  }
}

console.log(1);

for(var a of fibonnaci){
  console.log(a);
if(a>50)break;
}</script></body>
</html>