@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!

Tokyo, Japan Joined on Nov 15, 2017 https://kon-yu.work/

Education

Master degree of Computer science

@kon_yu

Sep 14 '20

How to Get mp3 file's Durations with Python

#python

1 min read

How to terminate Vim / Vi

@confused-nerd Thanks for your information. I didn't know tho...

Jun 4 '20

@kon_yu

Sep 11 '20

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

#javascript

1 min read

@kon_yu

Sep 7 '20

Using JavaScript to determine whether the client is iOS or Android

#javascript

15 1

1 min read

@kon_yu

Sep 6 '20

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

#javascript #async #await #arrowfunction

4 min read

@kon_yu

Jun 18 '20

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

1 min read

@kon_yu

Jun 16 '20

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

2 min read

@kon_yu

Jun 16 '20

Rake to flush out and delete unused image files in Rails

#rails

2 min read

@kon_yu

Jun 8 '20

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

#ruby

11 min read

@kon_yu

Jun 4 '20

Why Ruby Random object not to need a seed number

#ruby

5 min read

@kon_yu

May 28 '20

Installing the latest version of Ruby on Raspberry pi

#raspberrypi #ruby

2 min read

@kon_yu

May 28 '20

How to register DockerImage to DockerHub

#ruby #docker #centos

4 min read

@kon_yu

May 28 '20

How to check the connection between mysql and memcached in php

#php #mysql #memcached

2 min read

@kon_yu

May 28 '20

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

#aptget #debian #aptaddrepository #ubuntu

2 min read

@kon_yu

May 28 '20

Autoprefixer Rails autoprefixer-rails

#autoprefixer #rails #autoprefixerrails

2 min read

@kon_yu

May 28 '20

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

#bash #dockercompose #docker

1 min read

@kon_yu

May 28 '20

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

#heroku #docker #backup

3 min read

@kon_yu

May 28 '20

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

#hubot #slack

4 min read

@kon_yu

May 28 '20

Using select2 in ActiveAdmin by using activeadmin_addons

#rails #activeadmin #select2

2 min read

@kon_yu

May 28 '20

How to change the table used in DelayedJob

#delayedjob #rails

2 min read

@kon_yu

May 26 '20

How to terminate Vim / Vi

#vim #vi

4 3

1 min read

@kon_yu

May 26 '20

How to realize caching in Ruby classes

#ruby #rails

3 min read

@kon_yu

May 26 '20

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

#rails

3 min read

@kon_yu

May 25 '20

How to install jupyter notebook on Ubuntu 16.04

#jupyter #ubuntu1604

1 min read

@kon_yu

May 25 '20

Get the list of classes connected to the DB

#rails #rails5

1 min read

@kon_yu

May 25 '20

Explore files under a specific directory in Rails

#ruby #rails

1 min read

@kon_yu

May 25 '20

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

#ruby #rails

2 min read

@kon_yu

May 25 '20

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

#ruby

1 min read

@kon_yu

May 23 '20

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

#rails

2 min read

@kon_yu

May 23 '20

Determine if a particular validation error is occurring in AcitiveRecord

#railsrails5

2 min read

@kon_yu

May 23 '20

How to use Artillery for load testing with different input values

#artillery

2 min read

@kon_yu

May 22 '20

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

3 min read

@kon_yu

May 22 '20

Building AWS SAM environment and running Lambda with Ruby

#aws #sam #ruby #lambda

4 min read

@kon_yu

May 22 '20

Deploying with AWS SAM Running Lambda in Ruby

#aws #sam

4 min read

@kon_yu

May 22 '20

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

#css

2 min read

@kon_yu

May 22 '20

How to handle Enum in ActiveRecord

#rails

2 min read

@kon_yu

May 22 '20

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

#ruby

1 min read

@kon_yu

May 21 '20

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

#gatsby

1 min read

@kon_yu

May 21 '20

How to encode/decode base64 with JS

#javascript

1 min read

@kon_yu

May 21 '20

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

#awscli

1 min read

@kon_yu

May 21 '20

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

#mac #bash #zsh

11 1

1 min read

@kon_yu

May 21 '20

Output TouchDesinger's output to webcam for mac

#touchdesigner #webcam #camtwist

1 min read

@kon_yu

May 21 '20

Make the default of a variable of type Metabase date relative

#metabase #postgres

1 min read

DEV Community is a community of 871,761 amazing developers

Recent comments

How to terminate Vim / Vi