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@kon_yu

I am a freelance software engineer, media artist, technical advisor, CTO of a freelance guild, and have a cat. Shoul you have any plan to work with me, please contact me via dev.to message!

Location Tokyo, Japan Joined Joined on  Github logo Facebook logo Linkedin logo Youtube logo Website logo

Education

Master degree of Computer science

How to Get mp3 file's Durations with Python

How to Get mp3 file's Durations with Python

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1 min read
How to create a string of numbers with ¥, $, €, or £ in JavaScript.

How to create a string of numbers with ¥, $, €, or £ in JavaScript.

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1 min read
Using JavaScript to determine whether the client is iOS or Android

Using JavaScript to determine whether the client is iOS or Android

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1 min read
Let's organize how to write asynchronous processing using arrow functions and async/await

Let's organize how to write asynchronous processing using arrow functions and async/await

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4 min read
How to Solve a AWS Lambda error - Runtime.ImportModuleError: Error: Cannot find module 'jmespath'

How to Solve a AWS Lambda error - Runtime.ImportModuleError: Error: Cannot find module 'jmespath'

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1 min read
How to do not apply basic authentication to certain URLs in a Rails project with basic authentication method

How to do not apply basic authentication to certain URLs in a Rails project with basic authentication method

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2 min read
Rake to flush out and delete unused image files in Rails

Rake to flush out and delete unused image files in Rails

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2 min read
How to use (almost) all the functions of Enumerable modules: select, inject, take, and so forth

How to use (almost) all the functions of Enumerable modules: select, inject, take, and so forth

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11 min read
Why Ruby Random object not to need a seed number

Why Ruby Random object not to need a seed number

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5 min read
Installing the latest version of Ruby on Raspberry pi

Installing the latest version of Ruby on Raspberry pi

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2 min read
How to register DockerImage to DockerHub

How to register DockerImage to DockerHub

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4 min read
How to check the connection between mysql and memcached in php

How to check the connection between mysql and memcached in php

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2 min read
How to add a package not found by apt-get(debian, ubuntu both)

How to add a package not found by apt-get(debian, ubuntu both)

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2 min read
Autoprefixer Rails autoprefixer-rails

Autoprefixer Rails autoprefixer-rails

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2 min read
How to run multiple bash commands in CMD and docker-compose.yml of Dockerfile

How to run multiple bash commands in CMD and docker-compose.yml of Dockerfile

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1 min read
Daily backup of production staging using a Docker container for Heroku maintenance that can be deployed to Heroku

Daily backup of production staging using a Docker container for Heroku maintenance that can be deployed to Heroku

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3 min read
How to use Hubot with Slack to build, debug, and deploy to Heroku in a local environment

How to use Hubot with Slack to build, debug, and deploy to Heroku in a local environment

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4 min read
Using select2 in ActiveAdmin by using activeadmin_addons

Using select2 in ActiveAdmin by using activeadmin_addons

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2 min read
How to change the table used in DelayedJob

How to change the table used in DelayedJob

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2 min read
How to terminate Vim / Vi

How to terminate Vim / Vi

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1 min read
How to realize caching in Ruby classes

How to realize caching in Ruby classes

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3 min read
Performance comparison between SQL cache and variables in Rails, 7000 times difference

Performance comparison between SQL cache and variables in Rails, 7000 times difference

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3 min read
How to install jupyter notebook on Ubuntu 16.04

How to install jupyter notebook on Ubuntu 16.04

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1 min read
Get the list of classes connected to the DB

Get the list of classes connected to the DB

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1 min read
Explore files under a specific directory in Rails

Explore files under a specific directory in Rails

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1 min read
Get the list of attributes and columns of the inheritance class of ActiveRecord

Get the list of attributes and columns of the inheritance class of ActiveRecord

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2 min read
How to check if a particular method exists in a Ruby class and instance

How to check if a particular method exists in a Ruby class and instance

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1 min read
Convenient because updated_at does not update without changing the attributes of ActiveRecord and does not issue any extra SQL.

Convenient because updated_at does not update without changing the attributes of ActiveRecord and does not issue any extra SQL.

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2 min read
Determine if a particular validation error is occurring in AcitiveRecord

Determine if a particular validation error is occurring in AcitiveRecord

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2 min read
How to use Artillery for load testing with different input values

How to use Artillery for load testing with different input values

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2 min read
Why you shouldn't use current time to refine a batch run

Why you shouldn't use current time to refine a batch run

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3 min read
Building AWS SAM environment and running Lambda with Ruby

Building AWS SAM environment and running Lambda with Ruby

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4 min read
Deploying with AWS SAM Running Lambda in Ruby

Deploying with AWS SAM Running Lambda in Ruby

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4 min read
Organizing the behavior of even and odd in :nth-child

Organizing the behavior of even and odd in :nth-child

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2 min read
How to handle Enum in ActiveRecord

How to handle Enum in ActiveRecord

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2 min read
Error handling in begin rescue verifies that errors encountered during rescue can be rescued.

Error handling in begin rescue verifies that errors encountered during rescue can be rescued.

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1 min read
How to check the operation of Gatsby on a smartphone or other device that is under development in a local network

How to check the operation of Gatsby on a smartphone or other device that is under development in a local network

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1 min read
How to encode/decode base64 with JS

How to encode/decode base64 with JS

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1 min read
Checking the user information that is being accessed by AWS-CLI

Checking the user information that is being accessed by AWS-CLI

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1 min read
How to copy the path of the current directory to the clipboard (mac)

How to copy the path of the current directory to the clipboard (mac)

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1 min read
Output TouchDesinger's output to webcam for mac

Output TouchDesinger's output to webcam for mac

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1 min read
Make the default of a variable of type Metabase date relative

Make the default of a variable of type Metabase date relative

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1 min read
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