Use string concatenation to increase performance (#336)

benchmarks/benchmarks.js

@@ -1,11 +1,14 @@
 import { Bench } from 'tinybench';
+import { markdownTable } from 'markdown-table';
 
 import local from 'classnames-local';
+import bind from 'classnames-local/bind.js';
 import dedupe from 'classnames-local/dedupe.js';
 import localPackage from 'classnames-local/package.json' with { type: 'json' };
 
 import npm from 'classnames-npm';
 import npmDedupe from 'classnames-npm/dedupe.js';
+import npmBind from 'classnames-npm/bind.js';
 import npmPackage from 'classnames-npm/package.json' with { type: 'json' };
 
 if (localPackage.version !== npmPackage.version) {
@@ -40,9 +43,9 @@ const benchmarks = [
 
 export async function runBenchmarks () {
 	for (const benchmark of benchmarks) {
-		console.log(`Benchmarking '${benchmark.description}'.`);
+		console.log(`Benchmarking '${benchmark.description}'.\n`);
 		const bench = await runBenchmark(benchmark);
-		console.table(bench.table());
+		printTable(bench);
 	}
 
 	console.log('Finished!');
@@ -51,22 +54,23 @@ export async function runBenchmarks () {
 async function runBenchmark (benchmark) {
 	const bench = new Bench();
 
-	bench.add(`local#${benchmark.description}`, () => {
-		local(...benchmark.args);
-	});
+	bench.add('default/local', () => local(...benchmark.args));
+	bench.add('default/npm', () => npm(...benchmark.args));
 
-	bench.add(`npm#${benchmark.description}`, () => {
-		npm(...benchmark.args);
-	});
+	bench.add('bind/local', () => bind(...benchmark.args));
+	bench.add('bind/npm', () => npmBind(...benchmark.args));
 
-	bench.add(`local/dedupe#${benchmark.description}`, () => {
-		dedupe(...benchmark.args);
-	});
-
-	bench.add(`npm/dedupe#${benchmark.description}`, () => {
-		npmDedupe(...benchmark.args);
-	});
+	bench.add('dedupe/local', () => dedupe(...benchmark.args));
+	bench.add('dedupe/npm', () => npmDedupe(...benchmark.args));
 
 	await bench.run();
 	return bench;
 }
+
+function printTable(bench) {
+	const table = bench.table();
+	const headers = Object.keys(table[0]);
+	const data = table.map((entry) => headers.map((header) => entry[header]));
+
+	console.log(markdownTable([headers, ...data]) + '\n');
+}

benchmarks/package.json

@@ -12,6 +12,7 @@
     "classnames-local": "file:../",
     "classnames-npm": "npm:classnames@*",
     "http-server": "^14.1.1",
+    "markdown-table": "^3.0.3",
     "rollup": "^4.9.1",
     "tinybench": "^2.5.1"
   }

bind.js

@@ -11,33 +11,56 @@
 	var hasOwn = {}.hasOwnProperty;
 
 	function classNames () {
-		var classes = [];
+		var classes = '';
 
 		for (var i = 0; i < arguments.length; i++) {
 			var arg = arguments[i];
-			if (!arg) continue;
-
-			var argType = typeof arg;
-
-			if (argType === 'string' || argType === 'number') {
-				classes.push(this && this[arg] || arg);
-			} else if (Array.isArray(arg)) {
-				classes.push(classNames.apply(this, arg));
-			} else if (argType === 'object') {
-				if (arg.toString !== Object.prototype.toString && !arg.toString.toString().includes('[native code]')) {
-					classes.push(arg.toString());
-					continue;
-				}
-
-				for (var key in arg) {
-					if (hasOwn.call(arg, key) && arg[key]) {
-						classes.push(this && this[key] || key);
-					}
-				}
+			if (arg) {
+				classes = appendClass(classes, parseValue.call(this, arg));
 			}
 		}
 
-		return classes.join(' ');
+		return classes;
+	}
+
+	function parseValue (arg) {
+		if (typeof arg === 'string' || typeof arg === 'number') {
+			return this && this[arg] || arg;
+		}
+
+		if (typeof arg !== 'object') {
+			return '';
+		}
+
+		if (Array.isArray(arg)) {
+			return classNames.apply(this, arg);
+		}
+
+		if (arg.toString !== Object.prototype.toString && !arg.toString.toString().includes('[native code]')) {
+			return arg.toString();
+		}
+
+		var classes = '';
+
+		for (var key in arg) {
+			if (hasOwn.call(arg, key) && arg[key]) {
+				classes = appendClass(classes, this && this[key] || key);
+			}
+		}
+
+		return classes;
+	}
+
+	function appendClass (value, newClass) {
+		if (!newClass) {
+			return value;
+		}
+
+		if (value) {
+			return value + ' ' + newClass;
+		}
+
+		return value + newClass;
 	}
 
 	if (typeof module !== 'undefined' && module.exports) {

index.js

@@ -10,39 +10,57 @@
 
 	var hasOwn = {}.hasOwnProperty;
 
-	function classNames() {
-		var classes = [];
+	function classNames () {
+		var classes = '';
 
 		for (var i = 0; i < arguments.length; i++) {
 			var arg = arguments[i];
-			if (!arg) continue;
-
-			var argType = typeof arg;
-
-			if (argType === 'string' || argType === 'number') {
-				classes.push(arg);
-			} else if (Array.isArray(arg)) {
-				if (arg.length) {
-					var inner = classNames.apply(null, arg);
-					if (inner) {
-						classes.push(inner);
-					}
-				}
-			} else if (argType === 'object') {
-				if (arg.toString !== Object.prototype.toString && !arg.toString.toString().includes('[native code]')) {
-					classes.push(arg.toString());
-					continue;
-				}
-
-				for (var key in arg) {
-					if (hasOwn.call(arg, key) && arg[key]) {
-						classes.push(key);
-					}
-				}
+			if (arg) {
+				classes = appendClass(classes, parseValue(arg));
 			}
 		}
 
-		return classes.join(' ');
+		return classes;
+	}
+
+	function parseValue (arg) {
+		if (typeof arg === 'string' || typeof arg === 'number') {
+			return arg;
+		}
+
+		if (typeof arg !== 'object') {
+			return '';
+		}
+
+		if (Array.isArray(arg)) {
+			return classNames.apply(null, arg);
+		}
+
+		if (arg.toString !== Object.prototype.toString && !arg.toString.toString().includes('[native code]')) {
+			return arg.toString();
+		}
+
+		var classes = '';
+
+		for (var key in arg) {
+			if (hasOwn.call(arg, key) && arg[key]) {
+				classes = appendClass(classes, key);
+			}
+		}
+
+		return classes;
+	}
+
+	function appendClass (value, newClass) {
+		if (!newClass) {
+			return value;
+		}
+
+		if (value) {
+			return value + ' ' + newClass;
+		}
+
+		return value + newClass;
 	}
 
 	if (typeof module !== 'undefined' && module.exports) {