Why do you use java script

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This document discusses the author's experience with dynamically typed and statically typed programming languages. It summarizes how the author initially disliked dynamically typed languages like JavaScript because errors would not be caught until runtime. However, the author later discovered how TypeScript allows using static typing with Vue, gaining autocomplete and refactoring support while still using modern web technologies. The author encourages applying similar techniques and is looking to hire others interested in working with TypeScript at their company in Shizuoka.

Engineering

Why do you use
dynamically typed
language?
Jul. 6, 2019
Kazuhisa Kawashima

Who am I
● Name : Kazuhisa Kawashima
● Home : Shizuoka shi, aoi ku
● Company : YUMEMI inc. (株式会社ゆめみ)
● Job : Computer Engineer
● Favorite computer language : Scala, TypeScript

What is Yumemi?
Company Features
● We are a software engineering company.
● We value the growth of everyone.
● All employees are CEOs.
● The salary is decided by yourself.
● We decide all things by the proposal request.
Reference : https://note.mu/raykataoka/n/n50c282bcb305

My first time to meet JavaScript
Long long ago… (Over 20 years ago)
I made a web site. So, I used JavaScript by checking input
parameters.
After that I have not used JavaScript for a long time. Instead,
I used ruby in a project.
submit cancel
e-mail :
password :
hogehoge@hogehoge.com
Password is required!

I dislike a dynamically typed language.
Because of …
● Don’t check simple mistake before running.
○ Missing a type
○ Typo
○ Missing number of arguments
● Can’t use the IDE effectivery
○ Autocomplete
○ Refactoring

I want to make a web pages.
I try to make the web pages
as SPA.
I need to use JavaScript
to make the modern web
pages.

Vue and TypeScript
I found!
How to make the web pages
by statically typed language!
Vue is …
● Easy to understand
● Supported TypeScript
● Be able to use with modern tools

Sample code
<template>
<div>
<p @click="clickDay(day)">{{ day.getDate() }}</p>
</div>
</template>
<script lang="ts">
import { Component, Emit, Prop, Vue } from "vue-property-decorator";
@Component({
components: {
}
})
export default class Day extends Vue {
@Prop({ default: false })
day!: Date;
@Emit("clickDay")
clickDay(day: Date) {
}
}
</script>
5
The parent set value.
This is Date type.

It’s time to use TypeScript!
If you use TypeScript ...
● The compiler check simple mistake before running.
○ Missing a type
○ Typo
○ Missing number of arguments
● You’ll be able to use the IDE effectivery
○ Autocomplete
○ Refactoring

Finally
　　We are hiring!
Welcome those who want to work in Shizuoka with me!
E-mail : k_kawashima@yumemi.co.jp

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Why do you use java script

1. Why do you use dynamically typed language? Jul. 6, 2019 Kazuhisa Kawashima

2. Who am I ● Name : Kazuhisa Kawashima ● Home : Shizuoka shi, aoi ku ● Company : YUMEMI inc. (株式会社ゆめみ) ● Job : Computer Engineer ● Favorite computer language : Scala, TypeScript

3. What is Yumemi? Company Features ● We are a software engineering company. ● We value the growth of everyone. ● All employees are CEOs. ● The salary is decided by yourself. ● We decide all things by the proposal request. Reference : https://note.mu/raykataoka/n/n50c282bcb305

4. My first time to meet JavaScript Long long ago… (Over 20 years ago) I made a web site. So, I used JavaScript by checking input parameters. After that I have not used JavaScript for a long time. Instead, I used ruby in a project. submit cancel e-mail : password : [email protected] Password is required!

5. I dislike a dynamically typed language. Because of … ● Don’t check simple mistake before running. ○ Missing a type ○ Typo ○ Missing number of arguments ● Can’t use the IDE effectivery ○ Autocomplete ○ Refactoring

6. I want to make a web pages. I try to make the web pages as SPA. I need to use JavaScript to make the modern web pages.

7. Vue and TypeScript I found! How to make the web pages by statically typed language! Vue is … ● Easy to understand ● Supported TypeScript ● Be able to use with modern tools

8. Sample code <template> <div> <p @click="clickDay(day)">{{ day.getDate() }}</p> </div> </template> <script lang="ts"> import { Component, Emit, Prop, Vue } from "vue-property-decorator"; @Component({ components: { } }) export default class Day extends Vue { @Prop({ default: false }) day!: Date; @Emit("clickDay") clickDay(day: Date) { } } </script> 5 The parent set value. This is Date type.

9. It’s time to use TypeScript! If you use TypeScript ... ● The compiler check simple mistake before running. ○ Missing a type ○ Typo ○ Missing number of arguments ● You’ll be able to use the IDE effectivery ○ Autocomplete ○ Refactoring

10. Finally 　　We are hiring! Welcome those who want to work in Shizuoka with me! E-mail : [email protected]

11. Thank you for listening!

Why do you use java script

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