function greaterpart(x){ alert(Math.max.apply(this, x.toString().split('.')));} code example

Example: max method in js

// Math.max
finding maximum number

console.log(Math.max(1, 3, 2));
// expected output: 3

console.log(Math.max(-1, -3, -2));
// expected output: -1

const array1 = [1, 3, 2];

console.log(Math.max(...array1));
// expected output: 3