For ..in loop unexpected ;

Question

I have the following for loop in JS and it works in all browsers but I am getting an "Expected ; " error in IE11 for the for loop line. Do I have to change format to make it play nice?

for (var filter of filters) { 
   //do something
  }

Scroll down to the compatibility section: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Mark
– Mark, Commented Oct 5, 2018 at 17:42
Is it a for in loop like in the title of your question or a for of loop like in the code you posted? And is it IE11 or IE8? — Bergi
– Bergi, Commented Oct 5, 2018 at 17:43

Robin Zigmond · Accepted Answer · 2018-10-05 17:43:31Z

1

for...of is an ES6 feature and therefore unsupported in IE. You need to either translate this to an ordinary for loop, or transpile your code before running it in an old browser like IE.

answered Oct 5, 2018 at 17:43

Robin Zigmond

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5 Comments

Bergi Over a year ago

The alternative answer: don't use an outdated browser like IE, but use Edge instead.

Robin Zigmond Over a year ago

While I'd be delighted to see the back of IE, an inordinate number of users seem to still use it, and it's best to keep everyone happy if it's not too much effort.

chris Over a year ago

trust me lol i wish my customers didnt use IE, its like impossible to download these days idk why people still use it.

chris Over a year ago

anyways is for in support in IE? just not for of?

Robin Zigmond Over a year ago

Yes, for...in is fine in IE, apparently even back to IE6 developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… But it's a poor way to loop through an array, a regular for loop is almost always better.

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