This repository demonstrates a common error in JavaScript: attempting to perform operations on null or undefined values without proper handling. The bug.js file ...

This repository demonstrates a common error in JavaScript when handling null and undefined values. The foo function attempts to access the length property of a ...

今回は、JavaScriptでのnullや空文字、undefinedの判定方法について、それぞれの方法に分け、簡単に解説していきます。