Run results for: substr vs JSON.parse

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.108 Safari/537.36

Browser: Chrome 74

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
parseTestObject(stringObject);	3165573.8 Ops/sec
parseTestObject(bigStringObject);	3357524.2 Ops/sec
JSON.parse(bigJsonObject);	568596.2 Ops/sec
JSON.parse(jsonObject);	928193.8 Ops/sec
parseTestObjectUseArray(bigStringObject);	2136985.8 Ops/sec
parseTestObjectUseArray(stringObject);	1997845.8 Ops/sec
stringObject to vars	1610684.4 Ops/sec
bigStringObject to vars	1606031.4 Ops/sec

Script Preparation code:

var jsonObject = '{"value1": 15, "value2": 16, "value3": "value"}';
var stringObject = '15 16 value';

var bigJsonObject = '{"value1": 15, "value2": 16, "value3": "valueaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"}';

var bigStringObject = '15 16 valueaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';

function parseToString(stringValue, number) {
    var result = [];
    
    var prevSpaceIndex = -1;
    for(var i  = 0; i < number - 1; i++) {
        var spaceIndex = stringValue.indexOf(' ', prevSpaceIndex + 1);
        
        result[i] = stringValue.substr(prevSpaceIndex  + 1, spaceIndex - prevSpaceIndex  - 1);
        
        prevSpaceIndex = spaceIndex;
    }
    
    result[result.length] = stringValue.substr(spaceIndex+1);
	
	return result;
}

function parseTestObjectUseArray(value) {
    var array = parseToString(value, 3);
    
    return {
        value1: array[0],
        value2: array[1],
        value3: array[2],
      };  
}

function parseTestObject(stringValue) {
  var firstSpace = stringValue.indexOf(' ');
  var secondSpace = stringValue.indexOf(' ', firstSpace + 1);

  if(firstSpace == -1 || secondSpace == -1) {
	  throw Error("Malformed message");
  }

  return {
    value1: stringValue.substr(0, firstSpace),
    value2: stringValue.substr(firstSpace  + 1, secondSpace - firstSpace  - 1),
    value3: stringValue.substr(secondSpace + 1)
  };
}

Tests:

parseTestObject(stringObject);
var object = parseTestObject(stringObject);
parseTestObject(bigStringObject);
var object = parseTestObject(bigStringObject);
JSON.parse(bigJsonObject);
JSON.parse(bigJsonObject);
JSON.parse(jsonObject);
JSON.parse(jsonObject);
parseTestObjectUseArray(bigStringObject);
var object = parseTestObjectUseArray(bigStringObject);
parseTestObjectUseArray(stringObject);
var object = parseTestObjectUseArray(stringObject);
stringObject to vars
var firstSpace = stringObject.indexOf(' '); var secondSpace = stringObject.indexOf(' ', firstSpace + 1); if(firstSpace == -1 || secondSpace == -1) { throw Error("Malformed message"); } var value1 = stringObject.substr(0, firstSpace); var value2 = stringObject.substr(firstSpace + 1, secondSpace - firstSpace - 1); var value3 = stringObject.substr(secondSpace + 1);
bigStringObject to vars
var firstSpace = bigStringObject.indexOf(' '); var secondSpace = bigStringObject.indexOf(' ', firstSpace + 1); if(firstSpace == -1 || secondSpace == -1) { throw Error("Malformed message"); } var value1 = bigStringObject.substr(0, firstSpace); var value2 = bigStringObject.substr(firstSpace + 1, secondSpace - firstSpace - 1); var value3 = bigStringObject.substr(secondSpace + 1);

Run results for: substr vs JSON.parse

parseTestObject(stringObject);

parseTestObject(bigStringObject);

JSON.parse(bigJsonObject);

JSON.parse(jsonObject);

parseTestObjectUseArray(bigStringObject);

parseTestObjectUseArray(stringObject);

stringObject to vars

bigStringObject to vars