How to make promises work in IE11

Question

I have a simple code that runs perfectly on every browser except for the Internet Explorer 11  How can I make it work on all browsers   Codepen  Thanks in advance    use strict    let promise   new Promise  resolve  reject    gt       setTimeout      gt        resolve  result         1000        promise    then      result   gt          alert  Fulfilled      result              error   gt          alert  Rejected      error

User · Answer

You could try using a Polyfill  The following Polyfill was published in 2019 and did the trick for me  It assigns the Promise function to the window object   used like  window Promise https   www npmjs com package promise-polyfill  If you want more information on Polyfills check out the following MDN web doc https   developer mozilla org en-US docs Glossary Polyfill

User · Answer

If you want this type of code to run in IE11  which does not support much of ES6 at all   then you need to get a 3rd party promise library  like Bluebird   include that library and change your coding to use ES5 coding structures  no arrow functions  no let  etc     so you can live within the limits of what older browsers support   Or  you can use a transpiler  like Babel  to convert your ES6 code to ES5 code that will work in older browsers   Here s a version of your code written in ES5 syntax with the Bluebird promise library    lt script src  https   cdnjs cloudflare com ajax libs bluebird 3 3 4 bluebird min js  gt  lt  script gt    lt script gt    use strict    var promise   new Promise function resolve        setTimeout function             resolve  result           1000        promise then function result        alert  Fulfilled      result      function error        alert  Rejected      error         lt  script gt

[javascript] How to make promises work in IE11

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