Switch numbers in string

I have a string with space-separated unique numbers as following:

"2 4 13 14 28 33"

Need a quick and efficient way to switch a pair of them in form:

switchNumbers(2, 28)
// result: "28 4 13 14 2 33"

I could split the string and search for values, but that sounds boring. Any better idea?

---

也请尝试：

var numbers = "2 4 13 14 28 33";

function switchNum(from, to){
  return numbers.replace(/d+/g, function(num){
    return num == from ? to : num == to ? from :  num
  })
}

alert(switchNum(2, 28)) //result: "28 4 13 14 2 33"

---

You can take advantage of array functions instead of strings .

See comments inline in the code:

var str = "2 4 13 14 28 33";

// Don't use `switch` as name
function switchNumbers(a, b) {
    var arr = str.split(' ');
    // Convert string to array

    // Get the index of both the elements
    var firstIndex = arr.indexOf(a.toString());
    var secondIndex = arr.indexOf(b.toString());


    // Change the position of both elements
    arr[firstIndex] = b;
    arr[secondIndex] = a;


    // Return swapped string
    return arr.join(' ');
}


alert(switchNumbers(2, 28));

DEMO

---

我不能判断这是否无聊，但至少它不是分裂和循环:)

function switchNumbers(str, x, y) {
  var regexp = new RegExp('b(' + x + '|' + y + ')b', 'g'); // /b(x|y)b/g
  return str.replace(regexp, function(match) { return match == x ? y : x; });
}

var s = "2 4 13 14 28 33";

document.write('<pre>' + switchNumbers(s, 2, 28) + '</pre>');

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