javascript - return object within a reduce function -


why result of x

[object object]12

can't return object in reduce function? know in map, filter can return object, not sure what's wrong code below.

const raw = [{    "device_info": {      "name": "nokia",      "device_id": "123"    },    "age_range": {      "0-10": {        "age_range": "0-10",        "total_count": 15,        "male_count": 6,        "female_count": 9      },      "11-20": {        "age_range": "11-20",        "total_count": 11,        "male_count": 7,        "female_count": 4      }      }  }, {    "device_info": {      "name": "iphone",      "device_id": "456"    },    "age_range": {      "0-10": {        "age_range": "0-10",        "total_count": 1,        "male_count": 1,        "female_count": 0      },      "11-20": {        "age_range": "11-20",        "total_count": 2,        "male_count": 0,        "female_count": 2      }    }  }]    const x = raw.map(obj => {    return object.values(obj.age_range).reduce((acc, obj2) => ({      total_count: acc + obj2.total_count,      device_id: obj.device_info.device_id    }), 0)  })    console.log('x', x)

no clue what's wrong, need help.

as explained you: in first iteration, acc contains 0, return object. in next iteration, acc contain object, , try add object new total_count. suggest this:

const x = raw.map(obj => {   // calculate total   const total_count = object.values(obj.age_range).reduce((acc, item) => acc + item.total_count, 0)   // construct object   return { total_count, device_id: obj.device_info.device_id } })

working example:

const raw = [{    "device_info": {      "name": "nokia",      "device_id": "123"    },    "age_range": {      "0-10": {        "age_range": "0-10",        "total_count": 15,        "male_count": 6,        "female_count": 9      },      "11-20": {        "age_range": "11-20",        "total_count": 11,        "male_count": 7,        "female_count": 4      }      }  }, {    "device_info": {      "name": "iphone",      "device_id": "456"    },    "age_range": {      "0-10": {        "age_range": "0-10",        "total_count": 1,        "male_count": 1,        "female_count": 0      },      "11-20": {        "age_range": "11-20",        "total_count": 2,        "male_count": 0,        "female_count": 2      }    }  }]    const x = raw.map(obj => {    const total_count = object.values(obj.age_range).reduce((acc, item) => acc + item.total_count, 0)    return { total_count, device_id: obj.device_info.device_id }  })    console.log('x', x)

jsfiddle here.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more