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ethan-deng / PWA.md
Last active March 10, 2017 01:01
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ethan-deng / iPad-web.md
Last active March 24, 2017 20:42
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ethan-deng / Git.md
Last active December 8, 2017 03:49
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ethan-deng / NodeJS_Mongodb.md
Last active November 8, 2016 04:01

MERN

  • npm install express --save

  • npm install body-parser cookie-parser multer --save

  • npm install -g devtool

  • devtool app.js --watch

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ethan-deng / ReactAnimation.md
Last active November 3, 2016 20:52
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ethan-deng / Webpack_feature_flag.md
Last active October 31, 2016 06:04
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ethan-deng / Const_Closure.md
Created October 21, 2016 22:52

Closure and Const/Let

_createClass(Contact, [{
	    key: 'render',
	    value: function render() {
	      var self = this;
	      var controls = [];
	
	      var _loop = function _loop() {
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ethan-deng / WebPack.md
Created October 20, 2016 19:41
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ethan-deng / ReactPerf.md
Last active December 16, 2016 19:59

React Performance

Immutable.js

To summarize, the performance managment of React is about using shouldComponentUpdate with "Deep Change" and "Shallow Change" of state object.

First, when implementing shouldComponentUpdate, we always want to do shallow comparason only, since deep comparason is expensive.

Second, based on the first assumption, when we do "Deep Change" for example when we change an array in place using array push, pop, splice ... or change an object property value, the state objecct's reference never change and since the shouldComponentUpdate will be blind to these changes and thus it will always return false.

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ethan-deng / trello.md
Last active March 24, 2017 20:47