CouchDB - datascan example ddoc

gistfile1.txt

{
  "_id": "_design/datascan",
  "views": {
    "dead": {
      "map": "function (doc) {\n  if (doc.year_death != null)\n  {emit(doc.year_death, doc.stagename);}\n}"
    },
    "nationality": {
      "reduce": "_count",
      "map": "function (doc) {\n  emit(doc.nationality, 1);\n}"
    },
    "brits": {
      "map": "function (doc) {\n if (doc.nationality == \"British\")\n emit(doc._id, {StageName: doc.stagename, Name: doc.name});\n}"
    },
    "deadoralive": {
      "map": "function(doc) {\n    if (doc.year_death) emit(\"Dead\", 1);\n    else emit(\"Alive\", 1);\n}",
      "reduce": "_count"
    },
    "instrumentsplayed": {
      "map": "function (doc) { if(doc.stagename) emit(doc.stagename, doc.instruments); else emit(doc.name, doc.instruments);}"
    },
    "complex": {
      "map": "function (doc) {emit([doc.nationality, doc.name], doc.bands);}"
    },
    "age of death": {
      "map": "function (doc) {\n  var age_at_death = doc.year_death - doc.year_birth;\n  var name_to_use;\n  if (doc.stagename != null)\n  name_to_use = doc.stagename\n  else\n  name_to_use = doc.name;\n  if (age_at_death > 0)\n  emit(name_to_use, age_at_death);\n}"
    },
    "ageofdeath": {
      "map": "function (doc) {\n  var age_at_death = doc.year_death - doc.year_birth;\n  var name_to_use;\n  if (doc.stagename != null)\n  name_to_use = doc.stagename\n  else\n  name_to_use = doc.name;\n  if (age_at_death > 0)\n  emit(name_to_use, age_at_death);\n}"
    },
    "northamerican": {
      "map": "function (doc) {\n  if(doc.nationality == \"American\" || doc.nationality == \"Cuban\" || doc.nationality == \"Canadian\")\n  emit(doc.stagename, doc.name);\n}"
    },
    "born60s": {
      "map": "function (doc) {\n  if (doc.year_birth >= 1960 && doc.year_birth < 1970)\n  emit([doc.stagename,doc.name], doc.year_birth);\n}"
    },
    "approxage": {
      "map": "function(doc) {\n    if (!doc.year_death) \n    var age = 2017 - doc.year_birth;\n    if (age) \n    emit(age, [doc.stagename,doc.name]);\n}"
    },
    "averageage": {
      "reduce": "function (keys, values, rereduce) {\n    var allages = sum(values);\n    var pplcount = values.length;\n    var average = allages/pplcount;\n    average = Math.round(average);\n    return average;\n}",
      "map": "function(doc) {\n    if (!doc.year_death) \n    var age = 2017 - doc.year_birth;\n    if (age) \n    emit(null, age);\n}"
    },
    "instruments": {
      "map": "function(doc) {\n  if(doc.instruments) {\n    doc.instruments.forEach(function(inst) {\n      emit(inst, 1);\n    });\n  }\n}",
      "reduce": "_count"
    }
  },
  "language": "javascript"
}