flatten-property-of-object-in-array.js

var flatten = require('lodash.flatten')
var prop = require('propprop')

var requests = [
  {
    mutations: [
      { a: 'b' },
      { c: 'd' }
    ]
  },
  {
    mutations: [
      { e: 'f' },
      { g: 'h' }
    ]
  }
]

var reqOpts = {
  mutations: flatten(requests.map(prop('mutations')))
}

assert.deepEqual(reqOpts, {
  mutations: [
    { a: 'b' },
    { c: 'd' },
    { e: 'f' },
    { g: 'h' }
  ]
})