Syntax Error Using => In Ie

I have the following line of javascript code var res = Object.keys(packages).filter(e => packages[e] === true) The above works well in all the other browser apart from IE. IE c

Solution 1:

IE must not support arrow-functions. Just use the old function keyword.

.filter(function(e){ return packages[e] === true })

Side note, but you could also probably write this as:

.filter(function(e){ return packages[e] })

Unless packages[e]must actually be exactly equal to true and not just truthy.

Solution 2:

IE doesn't support the fat arrow notation (Edge does). See http://kangax.github.io/compat-table/es6/. You need the older function notation:

var res = Object.keys(packages).filter(function(e) { return packages[e] === true })

Solution 3:

CanIUse: Arrow function You cannot use it in IE;

var res = Object.keys(packages).filter(function(e) = {return packages[e] === true})