Set undefined javascript property before read

Question

var tr={};
tr.SomeThing=\'SomeThingElse\';
console.log(tr.SomeThing); // SomeThingElse
console.log(tr.Other); // undefined

tr.get=function(what){
    if (tr.hasOwnP         


        

Answer 1

While this solution isn't exactly what you were looking for, a JavaScript implementation of python's collections.defaultdict class might help:

var collections = require('pycollections');
var dd = new collections.DefaultDict([].constructor);
console.log(dd.get('missing'));  // []
dd.get(123).push('yay!');
console.log(dd.items()); // [['missing', []], [123, ['yay!']]]