Run results for: String format vs template literal

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; RMX1911) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.85 Mobile Safari/537.36

Browser: Chrome Mobile 94

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Template literal	17689.8 Ops/sec
String format	3689.7 Ops/sec

Script Preparation code:

String.format = function() {
  return String._toFormattedString(false, arguments);
};
String._toFormattedString = function(l, j) {
  var c = '',
    e = j[0];
  for (var a = 0; true; ) {
    var f = e.indexOf('{', a),
      d = e.indexOf('}', a);
    if (f < 0 && d < 0) {
      c += e.slice(a);
      break;
    }
    if (d > 0 && (d < f || f < 0)) {
      c += e.slice(a, d + 1);
      a = d + 2;
      continue;
    }
    c += e.slice(a, f);
    a = f + 1;
    if (e.charAt(a) === '{') {
      c += '{';
      a++;
      continue;
    }
    if (d < 0) break;
    var h = e.substring(a, d),
      g = h.indexOf(':'),
      k = parseInt(g < 0 ? h : h.substring(0, g), 10) + 1,
      i = g < 0 ? '' : h.substring(g + 1),
      b = j[k];
    if (typeof b === 'undefined' || b === null) b = '';
    if (b.toFormattedString) c += b.toFormattedString(i);
    else if (l && b.localeFormat) c += b.localeFormat(i);
    else if (b.format) c += b.format(i);
    else c += b.toString();
    a = d + 1;
  }
  return c;
};

var name = "name";
var id = "id";

Tests:

Template literal
for (let i = 0; i < 80; ++i) { let result = `${id}: 1, ${name}: someItem`; }
String format
for (let i = 0; i < 80; ++i) { let result = String.format("{0}: 1, {1}: someItem", id, name); }

Run results for: String format vs template literal

test speed, maybe also allocations

Template literal

String format