how to rm last 4 characters in a string in javascript code example

Example 1: javascript remove last character from string

var str = 'mystring';

// the character 'g' will be removed
str = str.slice(0, -1);

Example 2: javascript remove last character from string

var v1 = "1151.00";
v1 = v1.slice(0, -1); 
console.log(v1);

var v1 = "1151.00";
v1 = v1.substring(0, v1.length - 1);
console.log(v1);

console.log(parseFloat(v1).toFixed(1));

var s1 = "PHP7";
s1 = s1.substring(0, s1.length - 1);
console.log(s1);