node_modules/rambda/src/groupBy.js

export function groupBy(groupFn, list){
  if (arguments.length === 1) return _list => groupBy(groupFn, _list)

  const result = {}
  for (let i = 0; i < list.length; i++){
    const item = list[ i ]
    const key = groupFn(item)

    if (!result[ key ]){
      result[ key ] = []
    }

    result[ key ].push(item)
  }

  return result
}