Is there any way to use a dynamic key with node-mongodb-native?

Question

Is there any way to use dynamic keys with the node-mongodb-native driver? By this I mean having a variable hold the key instead of using the key directly.

As in when

Answer 1

2020 Edit: Object literals can now be created in a couple of handy new ways:

You can now use a variable as a property name in an object literal by wrapping it in square brackets:

const ID = "_id";
col.insert({ [ID]: "wak3ajakar00" });

You can use the variable name as the property name, and the variable value as the property value in an object literal like this:

const _id = "wak3ajakar00";
col.insert({ _id });

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Original Answer from 2011:

In object literal syntax, you cannot use a variable as the key name, only values. The way to do it, is the way you already discovered - create your object first, then add the property as a separate step using square bracket notation.

var obj = {};
var ID = "_id";
obj[ID] = "wak3ajakar00";

Answer 2

You can write a small function that creates such an object

var obj = function(key, value, obj) {
  obj = obj || {};
  obj[key] = value;
  return obj;
}

// Usage
foo = obj('foo' + 'bar', 'baz');
// -> {'foobar': 'baz'}

foo = obj('stack' + 'over', 'flow', foo);
// -> {'foobar': 'baz', 'stackover': 'flow'}

Don't know if calling this function obj is a good idea.