What is the difference between using Set() and array? Does this do the same or it depends on what you want to use them for?

Question

I'm asking because I'm seeing a little bit of similarities. #Newbie

For example:

```let arr = []

arr.push(1,2,3,4,5)```

And ...

```let arr = new Set()

arr.add(1).add(2).add(3).add(4).add(5)

for (let i of arr.values()) {
console.log(i)
}```

Answer 1

Besides the interface wich differ from one to another, the main difference is that you can store multiple times a v8alue in an Array, while a Set store uniques values...

For example:

var v, a = [], s = new Set(), t ='';
a.push(1,2,3,2,5);
s.add(1).add(2).add(3).add(2).add(4);

for (v of a) t += (t ? ',' : '')+v;
console.log('a:',t);
t = '';
for (v of s.values()) t += (t ? ',' : '')+v;
console.log('s:',t);

Answer 2

In map, you can refer to a value using the keys and you can perform actions on it using keys.