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[ES6] 17. Set
Es6 provides "Set", it likes array but the data inside should be unqiue.
"Set" is a construct function, you should call:
var s = new Set();
Methods:
1. add(value)
[2,3,5,4,5,2,2].map(x =>s.add(x) )for(num of s){ console.log(num); }//2, 3, 5, 4
2. delete(value)
[2,3,5,4,5,2,2].map(x =>s.add(x) );s.delete("3");for(num of s){ console.log(num); }//2, 5, 4
3. has(value)
[2,3,5,4,5,2,2].map(x =>s.add(x) );s.delete("3");for(num of s){ console.log(num); }s.has("3"); //false
4. size()
[2,3,5,4,5,2,2].map(x =>s.add(x) )for(num of s){ console.log(num); }s.size(); // 4
5. claer()
[2,3,5,4,5,2,2].map(x =>s.add(x) )for(num of s){ console.log(num); }s.clear(); s.size(); // 0
[ES6] 17. Set
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