v1.15.4

• Improved type checking for $env
• Added support for floats in sort() built-in
• Fixed: AST printing for ?? operator
• Fixed: only emit OpEqual{Int,String} for simple types
• Fixed: fetch without OpDeref (#467)
• Docs: categorize Language Definition functions (#452)
• Changed: ast.Node type now is not copied with ast.Patch

v1.15.3

• Added type checks to detect 42 in ["a"] as invalid.

v1.15.2

• Propagate uint32 func argument types in AST (#438)

v1.15.1

• Fixed type checker for the in operator.
• Fixed memory budget calculations for ranges.

v1.15.0

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

In this release:

• Added support for variables.

  let foo = filter(tweets, .Text contains "foo");
  let name = foo?.Author?.Name ?? "unknown";
  upper(name)

• Added configuration to enable/disable builtin functions.
• Added a bunch of optimizations for builtin function combinations:
  • len(filter()) and map(filter())
  • filter()[0] and filter()[-1]
• Added a bunch of new builtin functions:
  • sort, sortBy
  • groupBy
  • toPairs, fromPairs
  • take, reduce, mean, median.
• Fixed in-range optimization to be only applied to integers.
• Fixed float folding optimization.
• Fixed duration*integer mutliplications.
• Improved language and developer documentation.

Examples:

tweets | filter(.Size < 280) | map(.Content) | join(" -- ")

filter(posts, {
    let span = now() - .CreatedAt;
    let limit = 7 * duration("24h");
    span >= limit
})

v1.14.3

• Fixed builtin type checks for any

v1.14.2

• Fixed slice node String() with omitted from or to fields.

v1.14.1

• Added ast.String() to nodes.
• Added keys(), values() and type() builtins.
• Added the ability to disable builtins via expr.DisableBuiltin().
• Fixed bunch of errors with corner cases in type checkers.

v1.14.0

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

In this release:

• New builtin functions:

  • abs, int, float, string, max, min
  • trim, trimPrefix, trimSuffix
  • upper, lower
  • split, splitN, splitAfter, splitAfterN
  • replace, repeat, join, indexOf, lastIndexOf
  • hasPrefix, hasSuffix
  • toJSON, fromJSON, toBase64, fromBase64
  • now, duration, date
  • first, last, get

• New pipe | operator.

  1..9 | filter(# < 5) | map(# * 2)
  

  To enable the pipe operator add expr.ExperimentalPipes() option.

  program, err = expr.Compile(code, expr.ExperimentalPipes())

• New repl with interactive debugger.

v1.13.0

Expr is a Go package that offers a fast, simple, and safe engine for compiling and evaluating expressions. Ideal for implementing complex logic in configuration, it serves as a foundation for a dynamic business rule engine without the need for recompiling the program.

all(Tweets, .Len <= 240)

• Refactor deref by @antonmedv in #398