How to convert Set to string with space?

Question

I want to convert JavaScript Set to string with space.

For example, if I have a set like:

var foo = new Set();
foo.add('hello');
foo.add('world');
foo.add('JavaScript');

And I'd like to print the string from the set: hello world JavaScript (space between each element).

I tried below codes but they are not working:

foo.toString(); // Not working
String(foo); // Not working

Is there simplest and easiest way to convert from Set to string?

Solution

You can use Array.from:

Array.from(foo).join(' ')

or the spread syntax:

[...foo].join(' ')

Comments

[Simona Adriani]

Array.from is not supported by internet Explorer, if someone has to maintain the compatibility of its script, any other suggestion?

[Bence László]

Array.from is significantly faster in large sets, though.

[Clio Orgyán]

Use a polyfill @SimonaAdriani