MongoDB Shell support for map.set() I am trying to use the MongoDB shell to run some scripts. Inside the JavaScript I am attempting to run var map = new Map() then map.set(1,1).

However, I am getting the following error:

E QUERY    [js] TypeError: map.set is not a function :


I am running this mongo shell version: MongoDB shell version v4.2.1

Does the mongo shell not support the map.set() function?
No, they hide the standard implementation in implscope.cpp


  // This builtin map is a javascript 6 thing.  We want our version.  so
  // take theirs out


and implement a new one in types.js.

Well, you can workaround doing:

Map.prototype.set = Map.prototype.put