сложить числа js

var str = "7.70 17.00 17.00 9.50 "; 
var result = str.split(" ").reduce((res, item) => +item + res, 0); 
console.log(result);

function sum (text) { 
  let match 
  return !!(match = text.match(/[+-]?\d+(\.\d+)?/g)) ? 
    match.reduce((sum, curr) => +sum + +curr) 
  : 0 
} 
 
console.log(sum('7.70 17.00 17.00 9.50 ')) 
console.log(sum('10, 12, 40')) 
console.log(sum('1 12 510')) 
console.log(sum('LLLLLLLL')) 
console.log(sum('<tag first="30" second="-10" />')) 
console.log(sum('a: 5 и b: -5'))

function getSum(str) { 
 
  var arr = str.split(/\s+/); 
  var arrSum = 0; 
 
  for (var i = 0; i < arr.length; i++) { 
    arrSum += parseFloat(arr[i], 10); 
  } 
  return arrSum; 
 
} 
console.log(getSum("7.70 17.00  17.00 9.50"));