Enhancement of command syntax checking in the editor

In our previous post, we highlighted how improvements in type inference and error handling help make 4D development more reliable. The 4D code editor and VSCode already detect many issues early, without requiring compilation, giving you fast and useful feedback while you write your code.

With 4D 21 R3, we are extending these existing checks to cover an additional and very common source of errors: command parameters.

From now on, the code editor validates the arguments you pass to commands against the types defined in the documentation. This means that when a parameter expects a specific type, such as Text, Integer, Object, or Pointer, any mismatch is immediately detected and highlighted directly in your code:

All these checks happen directly in the code editor, without waiting for compilation. This reduces friction in your development workflow and helps you catch mistakes earlier, when they are easier to fix.

Conclusion

By bringing type validation directly into the code editor, 4D eliminates an entire class of avoidable errors before they even happen. No compilation required. No surprises later. Just cleaner, safer, and faster development.