javascript - Extracting IDs from an array -

i have array containing arrays different lengths. these arrays contain objects ids properties 1 below:

[     [{         docid: 'ep/l007177/1',         weight: 0.60196078431373     }, {         //...     },      //...     ],      [{         //...     }],     // ... ] 

then have array of ids each time.

example of other array:

docs:[ { id: 'as/p003/5' }, { id: 'ep/l007177/1'} ,......] 

how can extract (unique) numbers of indexes in original array contain ids have in other array?

i made function, work if give 1 id it:

var gettopics = function (ids, data) {     var indexes = [];     data.foreach(function(d, i) {         d.foreach(function(f) {                          if ((ids.indexof(f.docid) > -1) && (indexes.indexof(i) === -1)) {                 indexes.push(i);             }                            });     });     return indexes; } 

if do:

docs.foreach(function(o) {     list = gettopics(o.id,dataa)  })  

i 1 index, not expect.

as understand want find object id inside nested arrays (than may want it).

here sample how can it:

var arr1 = [    [{id: 1, data: 'xxx'}, {id: 2, data: 'yyy'}],    [{id: 3, data: 'zzz'}]];  function finbyid(id) {   var result = null;   arr1.foreach((row) => {     row.foreach((doc) => {        if(doc.id === id) result = doc;     })   })   return result; }