using a variable in mongodb update

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You need to build up your $set object programmatically:

var setModifier = { $set: {} };
setModifier.$set['directions.' + index + '.name'] = area.value;
Items.update(Session.get('selectedItem'), setModifier);

Update

If your JavaScript environment supports computed property names (e.g. node.js 4+), you can do this in one step:

Items.update(Session.get('selectedItem'), { $set: {
    ['directions.' + index + '.name']: area.value
}});

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