JavaScript Array to Set
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));
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));
By definition "A Set is a collection of values, where each value may occur only once." So, if your array has repeated values then only one value among the repeated values will be added to your Set.
var arr = [1, 2, 3];var set = new Set(arr);console.log(set); // {1,2,3}var arr = [1, 2, 1];var set = new Set(arr);console.log(set); // {1,2}So, do not convert to set if you have repeated values in your array.