Unique Array Values
var j = [...new Set([1, 2, 3, 3])]
>> [1, 2, 3]
Getting unique array values is another awesome usage of the spread operator. And don't forget you can merge object properties with the spread operator!
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If you’re forced to stay in EC5-land without the spread operator, you can use the pollyfillable
Doesn’t seem to work for arrays of objects unless I’m missing something.