underscore.js - Underscore _.flatten with prefix of the to be flatten object -

i need flatten object this:

{   productid: {     id: "123456-1234-1234-1234-123456789012",     type: "product",     name: "product"   } } 

to like

{   productid_id: "123456-1234-1234-1234-123456789012",   productid_type: "product",   productid_name: "product" } 

and i'm trying archive underscore, _.flatten doesn't have have parameter that.

you can .map , .reduce

var raw = {       productid: {         id: "123456-1234-1234-1234-123456789012",         type: "product",         name: "product"       }     },     flatten = _.map(raw, function(item, k){        return _.reduce(item, function(obj, val, key){             obj[[k,key].join('_')] = val;            return obj;         }, {});     }); console.log(flatten[0])