add an elemnt to an array in an object code example

Example 1: how to add objects in array

var a=[], b={};
a.push(b);    
// a[0] === b;

Example 2: how to append object in array javascript

var select =[2,5,8];
var filerdata=[];
for (var i = 0; i < select.length; i++) {
  filerdata.push(this.state.data.find((record) => record.id == select[i]));
}
//I have a data which is object,
//find method return me the filter data which are objects
//now with the push method I can make array of objects