how to add items in an array in javascript code example

Example 1: javascript append to array

var colors=["red","white"];
colors.push("blue");//append 'blue' to colors

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

Example 3: js add to array

let arr = [1, 2, 3, 4];

arr = [...arr, 5, 6, 7];

console.log(arr);