roll a js dice x times

diceTest.js

'use strict'

// Number -> Object
module.exports = rolls =>
  Array.from( Array(rolls) )
  .map(
    () =>
      Math.ceil( Math.random() * 6 )
  )
  .reduce(
    (acc, roll) =>
      Object.assign(
        acc,
        {
          [roll]: ( acc[roll] || 0 ) + 1
        }
      ),
    {}
  )