How to use variable as Object Key?

How to use a variable as an Object Key [MongoDB]

• I'm trying to use variable name given to me by my function, but its actually setting the object key equal to 'name' function addlist(name, item, id){ // Add to user's list var $push = {}; $push[name] = item; console.log(id); db.collection('newcon').update({_id: id}, {"$push": {name: item}}); ret(id); } Other solutions similar to this don't work, since I need to also have it build onto the array every time this function is called, not replace whatever is in it each time.

• Answer:

  JavaScript has no nice notation for creating an object where the keys are variables: var $push_query = {}; $push_query[name] = item; ... {"$push": $push_query} ...