Another Javascript trap with arrays
JavaScript arrays are a famous source of trouble. E.g. when you access index out of bounds, you don’t get an exception, you get undefined. This, by the way, breaks type […]
TypeScript
Writing unit tests with Cursor IDE
I created a “view model” like hook in React, and asked Cursor to write unit tests for it. The hook does not have any HTML code, but it uses a […]
More fun with recursive types in Typescript
Typescript allows a type to reference another type defined further down in the same file, which can lead to rather interesting constructs. The vanilla circular reference fails: However, the following […]
Recursive Types in Typescript: safely typing JSON value
I stumbled upon the following code in production: This sort of does the job, but any is a fruit of a poisonous tree: it should have had a much more […]
Typescript: this is just awesome. Substr is not the same as substring
In TypeScript (and JavaScript), both substr and substring are methods used to extract parts of a string, but they behave differently. This probably does not beat standard C++ class mt19937, […]
TypeScript: you can pass class method as lambda, but it will blow up
TypeScript allows passing class methods to functions that expect a lambda, but it won’t work at runtime. Consider this code: Suppose we have class Calculator like this: We can then […]