Javascript Set vs. Array performance

Question

It maybe because Sets are relatively new to Javascript but I haven\'t been able to find an article, on StackO or anywhere else, that talks about the performance difference b

Answer 1

console.time("set")
var s = new Set()
for(var i = 0; i < 10000; i++)
  s.add(Math.random())
s.forEach(function(e){
  s.delete(e)
})
console.timeEnd("set")
console.time("array")
var s = new Array()
for(var i = 0; i < 10000; i++)
  s.push(Math.random())
s.forEach(function(e,i){
  s.splice(i)
})
console.timeEnd("array")

Those three operations on 10K items gave me:

set: 7.787ms
array: 2.388ms