如何访问没有键的对象，只有值 javascript

Question

var hasDuplicates = "eyes";
var noDuplicates = new Set(hasDuplicates); // {"e", "y", "s"}


console.log(Object.keys(noDuplicates));   // []
console.log(Object.values(noDuplicates)); // []

I basically want to access the 'e', 'y', and the 's' of the set called 'noDuplicates'.

var setToArray = [];
for (spot in noDuplicates) {
    setToArray.push(Object.keys(noDuplicates)[spot])
}

Answer 1

You can use array spread syntax to convert a Set to array:

 var hasDuplicates = "eyes"; var noDuplicates = new Set(hasDuplicates); // {"e", "y", "s"} var setToArray = [...noDuplicates]; console.log(setToArray); 

You can also use Set.forEach() or a for...of loop to access the Set's values directly:

 var hasDuplicates = "eyes"; var noDuplicates = new Set(hasDuplicates); // {"e", "y", "s"} noDuplicates.forEach(v => console.log(v)); for(const v of noDuplicates) { console.log(v); } 

Answer 2

noDuplicates is a Set which provides an iterator. Simply use for...of or the spread operator [... noDuplicates] instead of for...in . Better yet, convert your set into an array directly with Array.from :

 let setToArray = Array.from(new Set([1, 1, 1, 2, 2])); console.log(setToArray); 

Answer 3

You can also use the Array.from() Method to convert between a Set and an Array:

 var hasDuplicates = "eyes"; var noDuplicates = new Set(hasDuplicates); var setToArray = Array.from(noDuplicates); console.log(setToArray);