remove from string starting and end result in node code example

Example 1: remove last character from string js

var str = "Your string"
str = str.slice(0, -1); 
console.log(str)
//returns "Your strin"

Example 2: javascript remove last character from string

let str = "12345.00";
str = str.substring(0, str.length - 1);
console.log(str);