JavaScript/TypeScript How to Restrict Possible String Arguments I want to limit the possible string arguments. How can I do it? This article is for you. I will show 4 ways to do it. Th... 2021.08.08 JavaScript/TypeScript
JavaScript/TypeScript Define array with multiple types in TypeScript Union type or tuple is useful to define multiple types in an array. It shows how to define it and use cases. However, if there are multiple types in an array, it's harder to handle the difference. Using an interface is often a better choice. 2021.08.06 JavaScript/TypeScript
Other techs How to write outer join more than 3 tables How can we write outer join to merge multiple tables? Do you need subquery in the query? This article shows you the solution. 2021.08.04 Other techs
Tips How to backup photos automatically This article shows how to automatically copy files that don't exist in the destination directory. I often copy files fro... 2021.08.02 Tips
Other techs Establish SQL Server in Docker container I tried to establish SQL Server in Docker because I wanted to learn SQL again. Create a Dockerfile and run It's possible... 2021.07.30 Other techs
Tips Difficulties of personal evaluation for programmer I have an interview session twice a year for my personal evaluation. I have to set goals at start of the year and have t... 2021.07.28 Tips
JavaScript/TypeScript How to implement Node-RED node in TypeScript The official site describes how to implement our own node in JavaScript. However, I don't find a page for TypeScript. I'... 2021.07.26 JavaScript/TypeScript
JavaScript/TypeScript Complete Class Guide in TypeScript Class is one of keys to be familir with Object Oriented Programming (OOP). Multiple variables and functions are in the s... 2021.07.24 JavaScript/TypeScript
JavaScript/TypeScript TypeScript Bracket notation causes index signature error TypeScript shows an error when we access an object with brackets like obj to get the value. How can we safely resolve it... 2021.07.22 JavaScript/TypeScript
JavaScript/TypeScript 8 ways to remove duplicates from Array in TypeScript This page shows 8 ways to remove duplicates from an array. It also compares the performance to be useful to decide which one to use for your case. It also covers the case where the element is object. 2021.07.20 JavaScript/TypeScript