A Go-centric expression language for dynamic configurations, offering safety, speed, and seamless Go integration.
Expr is a Go-centric expression language that provides a safe, fast, and intuitive expression evaluator for embedding dynamic logic in Go applications. It enables developers to create dynamic configurations, such as business rules or access controls, without compromising security or performance. The language is designed to be memory-safe, side-effect-free, and always terminating to prevent issues like infinite loops.
Go developers who need to embed dynamic expression evaluation in their applications, such as for business rule engines, configuration systems, or access control logic. It is particularly suited for projects requiring safe execution of user-defined or configuration-based logic.
Developers choose Expr over alternatives because it offers seamless integration with Go types without redefinition, static typing to prevent runtime errors, and optimized performance via an optimizing compiler and bytecode virtual machine. Its focus on safety, including isolation and termination guarantees, makes it ideal for security-critical applications.
Expression language and expression evaluation for Go
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Seamlessly works with Go types without redefinition, as shown in examples where structs like Tweet are directly used in expressions, reducing boilerplate code.
Memory-safe, side-effect-free, and always terminating, preventing security vulnerabilities and infinite loops, making it ideal for user-defined logic in critical systems.
Compile-time type checking with clear error messages, such as catching mismatched types in operations, which minimizes runtime errors and improves debuggability.
Uses an optimizing compiler and bytecode virtual machine, with benchmarks linked in the README showing it outperforms other expression evaluators in Go.
Exclusively designed for Go, so it cannot be easily integrated into projects using other programming languages, limiting its versatility in polyglot environments.
Side-effect-free nature prohibits expressions from modifying variables or having persistent effects, which can be a drawback for dynamic scripting that requires state changes.
While it includes useful built-ins like filter and map, the function library is not extensible with user-defined logic beyond what's provided, potentially requiring workarounds for complex needs.