{"action":"created","comment":{"url":"https://api.github.com/repos/nodejs/node/pulls/comments/59905341","id":59905341,"diff_hunk":"@@ -0,0 +1,63 @@\n+'use strict';\n+\n+const common = require('../common.js');\n+const assert = require('assert');\n+const v8 = require('v8');\n+\n+const bench = common.createBenchmark(main, {\n+  method: ['old', 'new'],\n+  millions: [100]\n+});\n+\n+function a(x, y) {","path":"benchmark/misc/defaultparams-bench.js","position":null,"original_position":12,"commit_id":"6d5058e215cc0c5025cc8e2be606f4f0f85ad6b0","original_commit_id":"91bd20464ea7f271f29e3a9037b13071ff77435a","user":{"login":"jasnell","id":439929,"avatar_url":"https://avatars.githubusercontent.com/u/439929?v=3","gravatar_id":"","url":"https://api.github.com/users/jasnell","html_url":"https://github.com/jasnell","followers_url":"https://api.github.com/users/jasnell/followers","following_url":"https://api.github.com/users/jasnell/following{/other_user}","gists_url":"https://api.github.com/users/jasnell/gists{/gist_id}","starred_url":"https://api.github.com/users/jasnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasnell/subscriptions","organizations_url":"https://api.github.com/users/jasnell/orgs","repos_url":"https://api.github.com/users/jasnell/repos","events_url":"https://api.github.com/users/jasnell/events{/privacy}","received_events_url":"https://api.github.com/users/jasnell/received_events","type":"User","site_admin":false},"body":"Fixed","created_at":"2016-04-15T16:56:14Z","updated_at":"2016-04-15T16:56:14Z","html_url":"https://github.com/nodejs/node/pull/6222#discussion_r59905341","pull_request_url":"https://api.github.com/repos/nodejs/node/pulls/6222","_links":{"self":{"href":"https://api.github.com/repos/nodejs/node/pulls/comments/59905341"},"html":{"href":"https://github.com/nodejs/node/pull/6222#discussion_r59905341"},"pull_request":{"href":"https://api.github.com/repos/nodejs/node/pulls/6222"}}},"pull_request":{"url":"https://api.github.com/repos/nodejs/node/pulls/6222","id":66670409,"html_url":"https://github.com/nodejs/node/pull/6222","diff_url":"https://github.com/nodejs/node/pull/6222.diff","patch_url":"https://github.com/nodejs/node/pull/6222.patch","issue_url":"https://api.github.com/repos/nodejs/node/issues/6222","number":6222,"state":"open","locked":false,"title":"benchmarks: add microbenchmarks for new ES6 features","user":{"login":"jasnell","id":439929,"avatar_url":"https://avatars.githubusercontent.com/u/439929?v=3","gravatar_id":"","url":"https://api.github.com/users/jasnell","html_url":"https://github.com/jasnell","followers_url":"https://api.github.com/users/jasnell/followers","following_url":"https://api.github.com/users/jasnell/following{/other_user}","gists_url":"https://api.github.com/users/jasnell/gists{/gist_id}","starred_url":"https://api.github.com/users/jasnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasnell/subscriptions","organizations_url":"https://api.github.com/users/jasnell/orgs","repos_url":"https://api.github.com/users/jasnell/repos","events_url":"https://api.github.com/users/jasnell/events{/privacy}","received_events_url":"https://api.github.com/users/jasnell/received_events","type":"User","site_admin":false},"body":"##### Checklist\r\n\r\n- [ ] tests and code linting passes\r\n- [ ] a test and/or benchmark is included\r\n- [ ] the commit message follows commit guidelines\r\n\r\n##### Affected core subsystem(s)\r\n\r\nbenchmarks\r\n\r\n##### Description of change\r\n\r\nAdds new microbenchmarks for destructuring, rest params and default params.\r\n\r\nNow that v8 v5 has landed, it makes sense to track the perf of various new language features. These are very simple raw micro-benchmarks.\r\n\r\nCurrent results from master:\r\n\r\n```\r\nbash-3.2$ ./node benchmark/misc/restparams-bench.js \r\nmisc/restparams-bench.js method=old millions=100: 11.42148\r\nmisc/restparams-bench.js method=new millions=100: 23.56694\r\nmisc/restparams-bench.js method=arguments millions=100: 14.49330\r\n\r\nbash-3.2$ ./node benchmark/misc/defaultparams-bench.js \r\nmisc/defaultparams-bench.js method=old millions=100: 26.88026\r\nmisc/defaultparams-bench.js method=new millions=100: 25.99777\r\n\r\nbash-3.2$ ./node benchmark/misc/destructuring-bench.js \r\nmisc/destructuring-bench.js method=old millions=100: 2230.47279\r\nmisc/destructuring-bench.js method=new millions=100: 15.22549\r\nbash-3.2$ \r\n```\r\n\r\n( Note how much slower the new destructuring assignment is for a simple var swap :-/ 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