javascript - ReferenceError: Set is not defined. Error utilizing Set data structure in Ionic app - Stack Overflow

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I have an ionic app that uses the set data structure in one of it's method. When I try to run the app on my android device(Android 5.0.2,API 21), I run into this error

ReferenceError: Set is not defined
at Object.myMethod

Here is a code snippet showing the line responsible for the error

myMethod: function(userid) {


      var user = [];

      var service = this;
      var userIDs = new Set();
      var promises = [];
    ...}

I am not a javascript guru but it seems to me that it might be a problem with the android web view on my device not having a built in implementation of the Set data structure. To further confuse matters, I tested this same app on another device(HTC One M8(Android 5.0.1,API 21)) and it worked fine with no errors shown. Does anybody know how to fix this?

I have an ionic app that uses the set data structure in one of it's method. When I try to run the app on my android device(Android 5.0.2,API 21), I run into this error

ReferenceError: Set is not defined
at Object.myMethod

Here is a code snippet showing the line responsible for the error

myMethod: function(userid) {


      var user = [];

      var service = this;
      var userIDs = new Set();
      var promises = [];
    ...}

I am not a javascript guru but it seems to me that it might be a problem with the android web view on my device not having a built in implementation of the Set data structure. To further confuse matters, I tested this same app on another device(HTC One M8(Android 5.0.1,API 21)) and it worked fine with no errors shown. Does anybody know how to fix this?

• javascript
• android
• ionic-framework

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2 Answers 2

Sorted by: Reset to default 3

You should try a polyfill for those devices that does not support Set:

https://github./medikoo/es6-set

It's not the most optimal option, but you could use dictionary with boolean values...

var userIDs = {};
userID["anyUserId"] = true;

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