Editing js split

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

var _String_split = String.prototype.split
, _String_split_shim_isnonparticipating = /()??/.exec("")[1] === void 0;

function nativeSplit(str, separator) {
  return str.split(separator)
}

function jsSplit(str, separator, limit) {
		// if `separator` is not a regex, use the native `split`
		if(!(separator instanceof RegExp)) {//if (Object.prototype.toString.call(separator) !== "[object RegExp]") {
			//http://es5.github.com/#x15.5.4.14
			//If separator is undefined, then the result array contains just one String, which is the this value (converted to a String). If limit is not undefined, then the output array is truncated so that it contains no more than limit elements.
			if(separator === void 0 && limit === 0)return [];

return _String_split.call(str, separator, limit);
		}

var output = []
			, flags = (separator["ignoreCase"] ? "i" : "") +
					(separator["multiline"] ? "m" : "") +
                    (separator["extended"] ? "x" : "") + // Proposed for ES6
                    (separator["sticky"]   ? "y" : "") // Firefox 3+
			, lastLastIndex = 0
            // Make `global` and avoid `lastIndex` issues by working with a copy
			, separator2
			, match
			, lastIndex
			, lastLength
		;

separator = new RegExp(separator.source, flags + "g");

str += ""; // Type-convert
		if (!_String_split_shim_isnonparticipating) {
            // Doesn't need flags gy, but they don't hurt
			separator2 = new RegExp("^" + separator.source + "$(?!\\s)", flags);
		}

/* Values for `limit`, per the spec:
         * If undefined: 4294967295 // Math.pow(2, 32) - 1
         * If 0, Infinity, or NaN: 0
         * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296;
         * If negative number: 4294967296 - Math.floor(Math.abs(limit))
         * If other: Type-convert, then use the above rules
         */
        limit = limit === void 0 ?
            -1 >>> 0 : // Math.pow(2, 32) - 1
            limit >>> 0 // ToUint32(limit)
		;

if (!limit) {
			return [];
		}

while (match = separator.exec(str)) {
            // `separator.lastIndex` is not reliable cross-browser
            lastIndex = match.index + match[0].length;

if (lastIndex > lastLastIndex) {
				output.push(str.slice(lastLastIndex, match.index));

// Fix browsers whose `exec` methods don't consistently return `undefined` for
                // nonparticipating capturing groups
				// __ NOT WORKING __ !!!!
				if (!_String_split_shim_isnonparticipating && match.length > 1) {
					match[0].replace(separator2, function() {
						for (var i = 1, l = arguments.length - 2; i < l; i++) {
							if (arguments[i] === void 0) {
								match[i] = void 0;
							}
						}
					});
				}

if (match.length > 1 && match.index < str.length) {
					output.push.apply(output, match.slice(1));
				}

lastLength = match[0].length;
				lastLastIndex = lastIndex;

if (output.length >= limit) {
					break;
				}
			}

if (separator.lastIndex === match.index) {
				separator.lastIndex++; /// Avoid an infinite loop
			}
		}

if (lastLastIndex === str.length) {
			if (lastLength || !separator.test("")) {
				output.push("");
			}
		} else {
			output.push(str.slice(lastLastIndex));
		}

return output.length > limit ? output.slice(0, limit) : output;
	}

var smalText = "test, test,test, test,test, test,test, test,test, test";

var largeText = "Sed ut perspiciatis unde, omnis iste, natus error sit voluptatem, accusantium doloremque, , ,  laudantium, totam rem aperiam, eaque ipsa quae, ab, illo inventore veritatis et, quasi architecto beatae vitae dicta sunt, explicabo. Nemo enim, ipsam, voluptatem quia voluptas sit aspernatur, aut, odit aut fugit, sed, quia, consequuntur, magni, dolores, eos, qui, ratione, voluptatem sequi nesciunt. Neque, porro quisquam est, qui, dolorem, ipsum, quia, dolor, sit, amet, consectetur, adipisci velit, sed, qui,a, no,n, numquam, eius,  , modi, tempora, incidunt, ut, labore et dolore magnam aliquam quaerat voluptatem. Ut, enim, ad minima, veniam, quis nostrum exercitationem ullam, , ,   , corporis,  suscipit, laboriosam, nisi, ut aliquid ex ea commodi, consequatur? Quis autem vel, eum, iure, reprehenderit qui in ea voluptate velit, esse quam nihil molestiae, consequatur, vel illum qui dolorem eum fugiat quo, voluptas nulla pariatur?, test ,  , test12 , 12 , , 2,33, , 4Sed ut perspiciatis unde, omnis iste, natus error sit voluptatem, accusantium doloremque, , ,  laudantium, totam rem aperiam, eaque ipsa quae, ab, illo inventore veritatis et, quasi architecto beatae vitae dicta sunt, explicabo. Nemo enim, ipsam, voluptatem quia voluptas sit aspernatur, aut, odit aut fugit, sed, quia, consequuntur, magni, dolores, eos, qui, ratione, voluptatem sequi nesciunt. Neque, porro quisquam est, qui, dolorem, ipsum, quia, dolor, sit, amet, consectetur, adipisci velit, sed, qui,a, no,n, numquam, eius,  , modi, tempora, incidunt, ut, labore et dolore magnam aliquam quaerat voluptatem. Ut, enim, ad minima, veniam, quis nostrum exercitationem ullam, , ,   , corporis,  suscipit, laboriosam, nisi, ut aliquid ex ea commodi, consequatur? Quis autem vel, eum, iure, reprehenderit qui in ea voluptate velit, esse quam nihil molestiae, consequatur, vel illum qui dolorem eum fugiat quo, voluptas nulla pariatur?Sed ut perspiciatis unde, omnis iste, natus error sit voluptatem, accusantium doloremque, , ,  laudantium, totam rem aperiam, eaque ipsa quae, ab, illo inventore veritatis et, quasi architecto beatae vitae dicta sunt, explicabo. Nemo enim, ipsam, voluptatem quia voluptas sit aspernatur, aut, odit aut fugit, sed, quia, consequuntur, magni, dolores, eos, qui, ratione, voluptatem sequi nesciunt. Neque, porro quisquam est, qui, dolorem, ipsum, quia, dolor, sit, amet, consectetur, adipisci velit, sed, qui,a, no,n, numquam, eius,  , modi, tempora, incidunt, ut, labore et dolore magnam aliquam quaerat voluptatem. Ut, enim, ad minima, veniam, quis nostrum exercitationem ullam, , ,   , corporis,  suscipit, laboriosam, nisi, ut aliquid ex ea commodi, consequatur? Quis autem vel, eum, iure, reprehenderit qui in ea voluptate velit, esse quam nihil molestiae, consequatur, vel illum qui dolorem eum fugiat quo, voluptas nulla pariatur?Sed ut perspiciatis unde, omnis iste, natus error sit voluptatem, accusantium doloremque, , ,  laudantium, totam rem aperiam, eaque ipsa quae, ab, illo inventore veritatis et, quasi architecto beatae vitae dicta sunt, explicabo. Nemo enim, ipsam, voluptatem quia voluptas sit aspernatur, aut, odit aut fugit, sed, quia, consequuntur, magni, dolores, eos, qui, ratione, voluptatem sequi nesciunt. Neque, porro quisquam est, qui, dolorem, ipsum, quia, dolor, sit, amet, consectetur, adipisci velit, sed, qui,a, no,n, numquam, eius,  , modi, tempora, incidunt, ut, labore et dolore magnam aliquam quaerat voluptatem. Ut, enim, ad minima, veniam, quis nostrum exercitationem ullam, , ,   , corporis,  suscipit, laboriosam, nisi, ut aliquid ex ea commodi, consequatur? Quis autem vel, eum, iure, reprehenderit qui in ea voluptate velit, esse quam nihil molestiae, consequatur, vel illum qui dolorem eum fugiat quo, voluptas nulla pariatur?";

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

var it = largeText.length / smalText.length;
while(--it >= 0)nativeSplit(smalText, /(,\s*)/)

Test 2

Title

Async (check if this is an asynchronous test)

Code

var it = largeText.length / smalText.length;
while(--it >= 0)jsSplit(smalText, /(,\s*)/)

Test 3

Title

Async (check if this is an asynchronous test)

Code

nativeSplit(largeText , /(,\s*)/)

Test 4

Title

Async (check if this is an asynchronous test)

Code

jsSplit(largeText, /(,\s*)/)