JavaScript Array to Set

Question

MSDN references JavaScript's Set collection abstraction. I've got an array of objects that I'd like to convert to a set so that I am able to remove (.delete()) various elements by name:

var array = [     {name: "malcom", dogType: "four-legged"},     {name: "peabody", dogType: "three-legged"},     {name: "pablo", dogType: "two-legged"} ]; 

How do I convert this array to a set? More specifically, is it possible to do this without iterating over the above array? The documentation is relatively lacking (sufficient for instantiated sets; not for conversions - if possible).

I may also be thinking of the conversion to a Map, for removal by key. What I am trying to accomplish is an iterable collection that can be accessed or modified via accessing the elements primarily via a key (as opposed to index).

Conversion from an array to the other being the ultimate goal.

Answer 1

Just pass the array to the Set constructor. The Set constructor accepts an iterable parameter. The Array object implements the iterable protocol, so its a valid parameter.

var arr = [55, 44, 65]; var set = new Set(arr); console.log(set.size === arr.length); console.log(set.has(65));

See here

Answer 2

If you start out with:

let array = [     {name: "malcom", dogType: "four-legged"},     {name: "peabody", dogType: "three-legged"},     {name: "pablo", dogType: "two-legged"} ]; 

And you want a set of, say, names, you would do:

let namesSet = new Set(array.map(item => item.name));