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(); //
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(); //