Is there any way to modify a Set data structure in iteration (ECMAScript 6)? -

the set object in es6 has foreach method, array object does. there way modify values when iterating on set object using foreach method?

for example:

// array object in es5 can modified in iteration var array = [1, 2, 3]; array.foreach(function(int, idx, a) {     a[idx] = int * int; }); array;  // => [1, 4, 9] 

but when iterating on set object,

// set not updated var set = new set([1, 2, 3]); set.foreach(function(val1, val2, s) {     val2 = val1 * val1; }) set;   // => [1, 2, 3] 

is there way achieve same effect array object？

i'd do

var set = new set([1, 2, 3]); set = new set(array.from(set, val => val * val)); 

to make new set new values, , replace old. mutating set iterate on bad idea , seems it's easy avoid in usecase.