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Learn with quizes about the JavaScript grammar k-kuwahara @kuwahara_jsri @clown0082 Oct 2, 2018 ʲαϙʔλʔζCoLabษڧձʳ

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About me const my_info = { Workplace: ‘Yumemi Inc’, Community: ‘Riot.js, Ionic, Dist’, Favorites: ‘CLI made by Node.js’, PokemonGO: ‘TL38’ }

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github.com/riot

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Sorry... " Because of time, I don’t mention all the grammar of JavaScript.

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⚠Attention⚠ We verified this slide with Google Chrome. Please check other browsers by yourself.

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History of JavaScript Quiz about the “scope” Quiz about the “closure” Quiz about the “this" Agenda

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History of JavaScript

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See this page https://qiita.com/a_rcsin/items/0a3c8c98c8d703c49a22 or See this slide https://qiita.com/Mic-U/items/c900a6f62862954d62e0

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Quiz about the “scope”

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There are three scopes in JavaScript

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global local block Variable declared at top level Variables declared in functions Variable declared in {}(block) Available from anywhere in the program Can be referenced only in functions Only available within {}(block)

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Question 1

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BTW,

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Answer 1

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Answer 2

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Question 4

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“window” is a global objects.

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Question5

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Quiz about the “closures”

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in advance…

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We can refer to the variable defined by the parent function

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Lexical scope

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Based on this…

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define from outer function “init” Function “init” is a function that returns a function

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Question 1

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Question 2

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Practical example code by: http://dqn.sakusakutto.jp/2012/02/javascript_13.html

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using jQuery

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Reference http://dqn.sakusakutto.jp/2009/01/javascript.html

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Quiz about the “this”

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“this” is also called a “context”.

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There are several contexts

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global function window objects bind methods arrow function methods of objects prototype chain

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Question 1

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BTW,

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arrow function

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Have a nice JavaScript life!!

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Publicity

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We’re looking for Engineers!!

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