javascript - Count length of items in nested js object -


given array this, how count of charts in particular category. each category can have multiple or no groups.

{    "categories":[       {          "title":"category 1",          "id":"cat1",          "groups":[             {                "title":"group 1",                "id":"grp1",                "charts":[                   {                      "title":"chart 1",                      "id":"chart1",                      "type":"line"                   }                ]             }          ]       },       {          "title":"category 2",          "id":"cat2",          "charts":[             {                "title":"chart 2",                "id":"chart2",                "type":"line"             }          ]       },       {          "title":"category 3",          "id":"cat3",          "charts":[             {                "title":"chart 3",                "id":"chart3",                "type":"line"             }          ]       }    ] }

is one-liner okay?

assuming data json structure:

data.categories     .map(c => [         c.title,         c.groups ?             c.groups.map(g => g.charts.length).reduce((a, b) => a+b) :             c.charts.length     ])

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