cevek
/ promise-devtools.js
Created
September 19, 2018 12:33
Devtools enhancement: Pause on exceptions inside promise.then or catch without checked caught in exceptions
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| function create(fn, name) { | |
| if (fn === undefined) return; | |
| const callback = data => { | |
| let ret; | |
| new Promise(() => (ret = fn(data))); | |
| return ret; | |
| }; | |
| callback.displayName = name; | |
| return callback; | |
| } |
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| function abc(obj, prop) { | |
| for (let j = 0; j < 1e7; j++) { | |
| var x = obj[prop]; | |
| } | |
| return x; | |
| } | |
| function abc2(obj) { | |
| for (let j = 0; j < 1e7; j++) { | |
| var x = obj.b; |
cevek
/ node 10.12.0 v8 flags
Last active
May 18, 2021 10:35
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| --use-strict (enforce strict mode) | |
| type: bool default: false | |
| --es-staging (enable test-worthy harmony features (for internal use only)) | |
| type: bool default: false | |
| --harmony (enable all completed harmony features) | |
| type: bool default: false | |
| --harmony-shipping (enable all shipped harmony features) | |
| type: bool default: true | |
| --harmony-regexp-sequence (enable "RegExp Unicode sequence properties" (in progress)) | |
| type: bool default: false |
cevek
/ example.js
Last active
October 19, 2018 20:21
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| var foo, bar; | |
| class Aaa { | |
| constructor(a, b) { | |
| this.a = a; | |
| this.b = b; | |
| } | |
| } | |
| class Bbb { |
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| https://cs.chromium.org/chromium/src/v8/src/runtime/runtime.h?l=20&rcl=05720af2b09a18be5c41bbf224a58f3f0618f6be |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Title</title> | |
| </head> | |
| <body> | |
| <script> |
cevek
/ ts_watcher.ts
Last active
June 30, 2019 11:06
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| import * as ts from 'typescript'; | |
| const watchCompilerHost = ts.createWatchCompilerHost( | |
| ['index.ts'], | |
| {strict: true, target: ts.ScriptTarget.ESNext}, | |
| ts.sys, | |
| ); | |
| const originalCreateProgram = watchCompilerHost.createProgram; | |
| watchCompilerHost.watchFile = (path, callback) => { | |
| // console.log('watchFile', path); | |
| return { |
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| specification | |
| interpretation | |
| initialization | |
| implementation | |
| persistence | |
| orientation | |
| inheritance | |
| environment | |
| compilation | |
| registration |
cevek
/ metrica.tsx
Last active
August 29, 2019 10:18
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| import * as React from 'react'; | |
| import * as ReactDom from 'react-dom'; | |
| type ZoneContext = {name: string; params?: {}; parent: ZoneContext | null; children: ZoneContext[]}; | |
| const Context = React.createContext<ZoneContext | null>(null); | |
| function useMetrika(someData?: {}) { | |
| const context = React.useContext(Context); | |
| const parents: ZoneContext[] = []; | |
| if (context !== null) { | |
| let ctx = context; |
cevek
/ cpucache-perf.js
Last active
November 26, 2019 07:10
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| function prepare(n) { | |
| const arr = []; | |
| for (let i = 0; i < n; i++) { | |
| arr[i] = {a: i % 2 === 0 ? -i : i, b: {h: {x: i}, c: {i: i, d: {e: {e: {u: {x: i}}}}}}}; | |
| } | |
| shuffleArray(arr); | |
| return arr; | |
| } | |
| function shuffleArray(array) { | |
| for (var i = array.length - 1; i > 0; i--) { |