JS 3.md

typeOf("Hello") => string

JS Object method

this

event callback stack vs callback queue

lodash, underscore

this in nested function won't work 3 solutions:

1. var that = this OR var _this = this
2. function(){}.bind(this); ✔︎
3. myFunction.call(this);

bind will overide the call!!!!

self calling function function(){}();

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