forEach() anonymous function not defined error

Question

I am getting "Uncaught ReferenceError: i is not defined" in chrome console. What is wrong with the forEach? Am I using the forEach() function correctly here?Thank you.

<!DOCTYPE html>

<script  type="text/javascript" src="d3.min.js">

<body>


<!--Place all DOM elements here -->


<script>

//Write your code here
var data = [132,71,337,93,78,43,20,16,30,8,17,21];
//console.log(data[0]);

var donut = {key:"Glazed", value: 132};
//console.log(donut.key, donut.value);

var donuts = [
    {key:"Glazed",    value: 132},
    {key:"Jelly",     value: 71},
    {key:"Holes",     value: 337},
    {key:"Sprinkles", value: 93}
];
//console.log(donuts[1].key, donuts[1].value);
/*
for(var i = 0, len = donuts.length; i < len; i++){
    console.log(donuts[i].key, donuts[i].value);
}
*/

donuts.forEach(function(entry){
    console.log(donuts[i].key, donuts[i].value);
});

</body>

It's a simple typo/editing error; vote to close and move on. You have no i variable in your version using forEach. Use entry instead of donuts[i]. — T.J. Crowder
– T.J. Crowder, Commented Feb 12, 2016 at 7:54

Cyril Cherian · Accepted Answer · 2016-02-12 07:49:40Z

8

It has to be this way:

donuts.forEach(function(entry, i){
    console.log(donuts[i].key, donuts[i].value);
});

or better without index:

donuts.forEach(function(donut){
    console.log(donut.key, donut.value);
});

answered Feb 12, 2016 at 7:49

Cyril Cherian

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1 Comment

christopher Over a year ago

Worth mentioning the declaration of i is commented out.

Sravan · Accepted Answer · 2016-02-12 07:57:50Z

0

For each should take a parameter, if called with any object. There are different ways to use foreach. This link will be useful to you.Foreach different usage...

answered Feb 12, 2016 at 7:57

Sravan

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