benchmark: URLSearchParams v.s. querystring

Add benchmarks to compare the performance between
URLSearchParams and querystring, remove duplicate
benchmarks.

benchmark/url/legacy-vs-whatwg-url-searchparams-parse.js

@@ -0,0 +1,61 @@
+'use strict';
+const common = require('../common.js');
+const { URLSearchParams } = require('url');
+const querystring = require('querystring');
+
+const inputs = {
+  noencode: 'foo=bar&baz=quux&xyzzy=thud',
+  encodemany: '%66%6F%6F=bar&%62%61%7A=quux&xyzzy=%74h%75d',
+  encodefake: 'foo=%©ar&baz=%A©uux&xyzzy=%©ud',
+  encodelast: 'foo=bar&baz=quux&xyzzy=thu%64',
+  multivalue: 'foo=bar&foo=baz&foo=quux&quuy=quuz',
+  multivaluemany: 'foo=bar&foo=baz&foo=quux&quuy=quuz&foo=abc&foo=def&' +
+                  'foo=ghi&foo=jkl&foo=mno&foo=pqr&foo=stu&foo=vwxyz',
+  manypairs: 'a&b&c&d&e&f&g&h&i&j&k&l&m&n&o&p&q&r&s&t&u&v&w&x&y&z'
+};
+
+const bench = common.createBenchmark(main, {
+  type: Object.keys(inputs),
+  method: ['legacy', 'whatwg'],
+  n: [1e5]
+});
+
+function useLegacy(n, input) {
+  querystring.parse(input);
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    querystring.parse(input);
+  }
+  bench.end(n);
+}
+
+function useWHATWG(n, input) {
+  new URLSearchParams(input);
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    new URLSearchParams(input);
+  }
+  bench.end(n);
+}
+
+function main(conf) {
+  const type = conf.type;
+  const n = conf.n | 0;
+  const method = conf.method;
+
+  const input = inputs[type];
+  if (!input) {
+    throw new Error('Unknown input type');
+  }
+
+  switch (method) {
+    case 'legacy':
+      useLegacy(n, input);
+      break;
+    case 'whatwg':
+      useWHATWG(n, input);
+      break;
+    default:
+      throw new Error('Unknown method');
+  }
+}

benchmark/url/legacy-vs-whatwg-url-searchparams-serialize.js

@@ -0,0 +1,63 @@
+'use strict';
+const common = require('../common.js');
+const { URLSearchParams } = require('url');
+const querystring = require('querystring');
+
+const inputs = {
+  noencode: 'foo=bar&baz=quux&xyzzy=thud',
+  encodemany: '%66%6F%6F=bar&%62%61%7A=quux&xyzzy=%74h%75d',
+  encodefake: 'foo=%©ar&baz=%A©uux&xyzzy=%©ud',
+  encodelast: 'foo=bar&baz=quux&xyzzy=thu%64',
+  multivalue: 'foo=bar&foo=baz&foo=quux&quuy=quuz',
+  multivaluemany: 'foo=bar&foo=baz&foo=quux&quuy=quuz&foo=abc&foo=def&' +
+                  'foo=ghi&foo=jkl&foo=mno&foo=pqr&foo=stu&foo=vwxyz',
+  manypairs: 'a&b&c&d&e&f&g&h&i&j&k&l&m&n&o&p&q&r&s&t&u&v&w&x&y&z'
+};
+
+const bench = common.createBenchmark(main, {
+  type: Object.keys(inputs),
+  method: ['legacy', 'whatwg'],
+  n: [1e5]
+});
+
+function useLegacy(n, input, prop) {
+  const obj = querystring.parse(input);
+  querystring.stringify(obj);
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    querystring.stringify(obj);
+  }
+  bench.end(n);
+}
+
+function useWHATWG(n, input, prop) {
+  const obj = new URLSearchParams(input);
+  obj.toString();
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    obj.toString();
+  }
+  bench.end(n);
+}
+
+function main(conf) {
+  const type = conf.type;
+  const n = conf.n | 0;
+  const method = conf.method;
+
+  const input = inputs[type];
+  if (!input) {
+    throw new Error('Unknown input type');
+  }
+
+  switch (method) {
+    case 'legacy':
+      useLegacy(n, input);
+      break;
+    case 'whatwg':
+      useWHATWG(n, input);
+      break;
+    default:
+      throw new Error('Unknown method');
+  }
+}