how to substring last character in javascript code example

Example 1: js get last 4 digits

const id = "ctl03_Tabs1";
console.log(id.slice(id.length - 5)); //Outputs: Tabs1
console.log(id.slice(id.length - 1)); //Outputs: 1

Example 2: how to get last string in javascript

'abc'.slice(-2);