how to delete the previous list of the array in javascript code example

Example 1: remove item from array by id

var myArr = [{id:'a'},{id:'myid'},{id:'c'}];
var index = arr.findIndex(function(o){
     return o.id === 'myid';
})
if (index !== -1) myArr.splice(index, 1);

Example 2: take off element form end of array

const colors = ["Blue", "Green", "Red", "Yellow"];
colors.pop();

console.log(colors); // ["Blue", "Green", "Red"]