javascript - return Object.keys in a map got undefined -


what's wrong loop below? want calculate total_count , return [total, total] after manipulation within map, got undefined.

my raw data

const raw = [{   "device_info": {     "name": "cam1",   },   "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     },     "21-30": {       "age_range": "21-30",       "total_count": 922,       "male_count": 452,       "female_count": 470     }   } }, {   "device_info": {     "name": "cam2",   },   "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     },     "21-30": {       "age_range": "21-30",       "total_count": 90,       "male_count": 58,       "female_count": 32     }   } }]

loop

const x = raw.map(obj => {   return object.keys(obj).foreach(key => {     let total = 0     if (key === 'age_range') {       total = object.keys(obj.age_range).reduce((acum, innerkey) => {         return acum + obj.age_range[innerkey].total_count       }, 0)       console.log(total)     }   }); })  console.log('x', x)

https://jsfiddle.net/19m3f7fs/1

array#foreach doesn't return anything, use array#map , object.values instead:

const x = raw.map(obj => {   return object.values(obj.age_range).reduce((acc, item) => acc + item.total_count, 0) })

working example:

const raw = [{    "device_info": {      "name": "cam1",    },    "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      },      "21-30": {        "age_range": "21-30",        "total_count": 922,        "male_count": 452,        "female_count": 470      }    }  }, {    "device_info": {      "name": "cam2",    },    "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      },      "21-30": {        "age_range": "21-30",        "total_count": 90,        "male_count": 58,        "female_count": 32      }    }  }]    const x = raw.map(obj => object.values(obj.age_range).reduce((acc, item) => acc + item.total_count, 0))    console.log(x)


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