.assignSymbols(target, source)

Converts each property name on the source object to a well known symbol and uses that symbol to set the corresponding value on target.

This is used to easily set symbols correctly even when symbol isn't natively supported.

canReflect.assignSymbols(Map.prototype, {
  "can.getKeyValue": Map.prototype.get
})

If a source property name matches a symbol on Symbol (like iterator on Symbol.iterator), that symbol will be used:

canReflect.assignSymbols(ArrayLike.prototype, {
  "iterator": function() { ... }
})
ArrayLike.prototype[Symbol.iterator] = function(){ ... }