ThreeHammers2_ramda_version

var R = require('ramda');

var
//[[key, value]] -> {key: [[key, value]]}
groupByKey = R.groupBy(R.head),

//{'':a, 'b':b} -> {'b':b}
rejectEmptyKeys = R.pickBy(function(value, key) {return key !== '';}),

//[[key, value]] -> [value | undefined]
extractValueFromPair = R.map(function(pair) {return pair[1];}),

//[a] -> [a] | a
extractValueFromSingleArray = function(a) {
    return (a.length === 1) ? R.head(a) : a;
},

//[[key, value]], {key: value}
objectizePairs = R.pipe(
    groupByKey,
    rejectEmptyKeys,
    R.map(extractValueFromPair),
    R.map(extractValueFromSingleArray)
),

//String -> {a: [a] | a}
objectizeUrlSearch = R.pipe(
    R.split('&'),
    R.map(R.split('=')),
    objectizePairs
);

module.exports =  {
  objectizeUrlSearch    : objectizeUrlSearch
};