JSFiddle - React, Tailwind, and code Playground

by Santosh Giridhara

JavaScript

/* var str = "(1,2),(3,4),(5,6)"; */
var str = '(4, 5, 3, 6), (6, 2, 3, 5), (9, 3, 4, 5), (1, 4, 5, 2)';
var idx = -1,
  sum = 1;

do {
  var idx = str.indexOf('(', idx + 1);
  var num = str.substr(idx + 4, 1); console.log(num);
  if (!isNaN(num)) {
    sum = sum * num;
  }
} while (idx > -1)
console.log(sum);