Trying to work out a map reduce on mongo that would use field value as parameter name of the emitted object.

To simply what I'm tying to do is the following:

emit_object = {}
param_name = "param1"
param_value = 1
emit_object.param_name = param_value

The object I wish to construct is:

{ "param1" : 12 }

Yet the being constructed is the following:

{ "param_name" : 12 }

Does JS support this "dynamic" behavior of object construction? (Mongo uses SeaMonkey JS engine, if that's relevant).

Thank you, Maxim.

Trying to work out a map reduce on mongo that would use field value as parameter name of the emitted object.

To simply what I'm tying to do is the following:

emit_object = {}
param_name = "param1"
param_value = 1
emit_object.param_name = param_value

The object I wish to construct is:

{ "param1" : 12 }

Yet the being constructed is the following:

{ "param_name" : 12 }

Does JS support this "dynamic" behavior of object construction? (Mongo uses SeaMonkey JS engine, if that's relevant).

Thank you, Maxim.

• javascript
• mongodb
• mapreduce

2 Answers 2

emit_object[param_name] = param_value

emit_object[param_name]

The name is "bracket notation", there is also "dot notation to access" Object in javascript