Question 1

goval vs govaluate which one is better for Go?

Accepted Answer

goval offers more intuitive syntax, better type support with automatic int/float conversion, and higher performance via a single-pass parser, while govaluate might be preferred if you need an AST for manipulation. Choose goval for speed and clarity, govaluate for AST-based features.

Question 2

How to add custom functions in goval?

Accepted Answer

Define functions in a map and pass them to the Evaluator, as shown in the README with examples like implementing strlen or regex matching. Each function must match the goval.ExpressionFunction signature and handle type conversion manually.

Question 3

Does goval support regular expressions?

Accepted Answer

Yes, but only through custom functions; there's no built-in regex operator. The README demonstrates how to create a `matches` function using Go's regexp package, allowing regex evaluation within expressions.

Question 4

Is goval safe for evaluating user-input expressions?

Accepted Answer

It provides read-only variable access and no execution of arbitrary Go code, but custom functions can introduce risks. Sandboxing isn't built-in, so validate inputs and limit function capabilities to prevent security issues like injection.

Question 5

How does goval handle bitwise operations on different systems?

Accepted Answer

Bitwise not and shift operations yield different results on 32-bit vs 64-bit architectures due to int size differences, as documented. This requires careful testing if cross-platform consistency is critical for your application.

Question 6

Can goval evaluate expressions from JSON data?

Accepted Answer

Yes, since it supports maps and arrays, you can pass JSON-unmarshaled data as variables. However, it doesn't parse JSON directly; you need to convert JSON to Go maps or slices first for evaluation.

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