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JSFiddle - React, Tailwind, and code Playground

JavaScript

var testData = [{id:1,data:'abc'},{id:2,data:'efg'},{id:3,data:'pqr'},{id:4,data:'xyz'}]
var res = []
   
    testData.forEach(function(o){ 
           if(o.id % 2 == 0) { //your condition..
              res.push({nid:o.id, ndata: o.data}) 
           } 
    });

alert(JSON.stringify(res))

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JSFiddle - React, Tailwind, and code Playground

JavaScript

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