how to create dynamic key and valuse in javascript array -

input json

0===>{"eid":12,"gender":"1","age":1,"pass":["2","1"]} 1===>{"eid": 11,"gender":"0","age":1,"pass":["1","3"]} 2===>{"eid":20,"gender":"1","age":1,"pass":["2","3"]} 

how create new array.. push ids based on pass numbers

ex: in loop display

passid => 2 .... eid => 12, 20

2 ==> ["12","20"] 1 ==> [12, 11] 3 ==> [11,20] 

use filter , some check contents of pass array , return respective eid values:

function grabber(data, pass) {     return data.filter(function (el) {         return el.pass.some(function (num) {             return +num === pass;         })     }).map(function (el) {         return el.eid;     }); }  grabber(data, 1); // [12, 11] grabber(data, 2); // [12, 20] grabber(data, 3); // [11, 20] 

demo

update

realised on way home work don't need some. further, answer comment, here's how might search pass , gender:

function grabber(data, options) {     return data.filter(function (el) {         return el.pass.indexof(options.pass) > -1 && el.gender === options.gender;     }).map(function (el) {         return el.eid;     }); }  grabber(data, { gender: '0', pass: '1' }); // [11] 

demo