Expr Versions Save

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

output, err := expr.Eval("metric > 100", map[string]any{
    "metric": 200,
})

In this release:

• Added compiler optimization for boolean operations between all, any, none functions (#626)
• Added optional predicate to sum() builtin (#592)
• Added sum() compiler optimization c2b609e edb1b5a
• Improved WithContext to work for methods on env struct (#602)
• Improved count() builtin: now predicate is optional 725b702
• Fixed printing of combinations conditional with binary nodes 6157395
• Fixed optional chaining to return proper nil 5804ccb

Expr Editor

The Expr Editor is an embeddable code editor written in JavaScript with full support of Expr language.

Expr Pro

Expr Pro is a set of extensions for Expr for advanced use cases. It includes expressions explanation, performance profiling, and more.

This release reverts a wrong compiler optimization for all, any, one, none predicates (#555).

The optimization contains error logic which can lead to a wrong expression.

It is highly recommended to upgrade to the latest version.

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

program, err := expr.Compile(`let x = 2 + 2; x ^ x`)
output, err := expr.Run(program, env)

In this release:

• Improved printing for maps: {(foo + bar): 42}

Expr Editor

The Expr Editor is an embeddable code editor written in JavaScript with full support of Expr language.

Expr Pro

Expr Pro is a set of extensions for Expr for advanced use cases. It includes expressions explanation, performance profiling, and more.

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

program, err := expr.Compile(`now() - created_at < duration("24h")`)
output, err := expr.Run(program, env)

In this release:

• Added spans (#584)
• Added support for chained comparison 1 < 2 < 3 (#581)
• Improved builtin int: unwraps underlying int value (#611)
• Improved builtin min, max, sum, mean, median (#580, #576)
• Improved bools comparison to be without reflect.DeepEqual (#585)
• Fixed case with expr.Operator passes before expr.Env caused error (#606)
• Fixed -1 not in [] expressions (#590)

Expr Editor

The Expr Editor is an embeddable code editor written in JavaScript with full support of Expr language.

Expr Pro

Expr Pro is a set of extensions for Expr for advanced use cases. It includes expressions explanation, performance profiling, and more.

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

program, err := expr.Compile(`now() - created_at < duration("24h")`)
output, err := expr.Run(program, env)

In this release:

• Fixed recursive operator overloading bug (#548, #554)
• Fixed AST printing of ?.[ operator (ffaec9e)
• Fixed string literal slicing error (#543)
• Compilation performance improvements (95084fb)
• Improved functions call performance (ed89647)
• Refactored groupBy() and sortBy() builtins (#562)
• Added operator overloading with expr.Function() (#408)
• Added concat() builtin (#565)
• Added reverse() builtin (#553)
• Added program.Locations() method (e53cefe)
• Added optional array access array?.[42] (#550)
• Added compiler optimization for jump opcodes (#545)
• Added compiler optimization for boolean operations with all, any, one, none functions (#555)

Expr Editor

The Expr Editor is an embeddable code editor written in JavaScript with full support of Expr language.

Expr Pro

Expr Pro is a set of extensions for Expr for advanced use cases. It includes expressions explanation, performance profiling, and more.

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

In this release:

• Improved VM speed by 5%-15% (#521)
• Improve AST printing for boolean operators
• Improved type checker (#527)
• Added option to override built-ins (#522)
• Added method to get AST tree from program: .Node() (#528)
• Added new Valuer patcher (#525)
• Added expr.WarnOnAny() option
• Changed expr.As*() options behavior to accept any by default
• Fixed type checker to visit all arguments of func even if arguments count mismatch
• Fixed type propagation in AST for any type in type checker
• Fixed context patcher (#526)
• Fixed race condition in working with variables (#523)
• Fixed pipeline and call parsing

Addition

In addition to open-source version of Expr, we have an embeddable Expr Editor and Expr Pro packages.

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

output, err := expr.Eval(`now() - created_at < duration("24h")`, env)

In this release

• Added builtin functions for bit operations. (#496)
• Added support for raw string literals. (#485)

  `raw string`
  

• Fixed type checker panic on embedded pointer to struct field. (#500)
• Removed redundant fields from ast nodes. (#504) (#503)
• Improved Language Definition documentation.

Expr Editor

The Expr Editor is an embeddable code editor written in JavaScript with full support of Expr language.

Expr is a Go-centric expression language designed to deliver dynamic configurations with unparalleled accuracy, safety, and speed.

In this release:

• Fixed commutative property for comparison between a value and a pointer. (#490)
• Checker: forbid accessing built-ins and custom functions from $env. (#495)
• Enhanced the number parser to include support for parsing hexadecimal, binary, and octal literals. (#483)
• Added GetSource() method to vm.Program. (#491)

• New module path expr-lang/epxr ⚠️
• Added expr.WithContext() option to pass context to custom functions.
• Added ast package comments.
• Hidden internal fields in vm.Program.

• Added ceil(), floor() and round() function.
• Fixed type checker for float arguments.