How to iterate over a Set in TypeScript?

Question

How do you iterate over a set in TypeScript? for..of does not work:

'Set<string>' is not an array type or a string type 

.forEach is not acceptable, because it hides this. I'd prefer not to do a while loop in a try catch block. What am I missing? It can't it possibly so clumsy as to require try {while} catch {}.

Answer 1

@SnareChops was mostly correct:

mySet.forEach(function(item){     // do something with "this" }, **this**); 

This works.

I'm guessing:

for(item of mySet.values()){ } 

Would work if I weren't working with es-shim stuff which is messing everything up for me. But the shim stuff is prescribed by the Angular 2 crew so ¯_(ツ)_/¯

The only other thing that worked was:

for (var item of Array.from(set.values())) { } 

or something like that, which is just terrible.

Answer 2

You can still use .forEach with the correct this by using a regular function instead of an arrow function

mySet.forEach(function(item){     expect(this).toEqual(item); }); 

Compared to

class MyClass{     ...     doSomething():{         mySet.forEach((item) => {             expect(this instanceof MyClass).toEqual(true);         });     } } 

Another way to iterate is to use a for loop over the values

for(item of mySet.values()){     ... } 

More information on iterating Set with foreach can be found here