how to remove the last character of a string after the last space javascript code example

Example 1: javascript remove last character from string

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

Example 2: javascript remove last character from string

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