Sourced from github.com/antonmedv/expr's releases.

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
})

... (truncated)

• 5916dc2 Add type checks for 42 in ["a"] as invalid
• 89ddc14 Delete fuzz_coverage_test.go
• 709c5dd Propagate uint32 arguments types in ast (#438)
• f527a33 Add fuzz filter
• 01c358d Fix type checker for "in" operator
• 6001a17 Add var names in repl
• 46309b3 Fix size check
• b05f809 Add SECURITY.md
• bbbabde Fix if
• 3f563fc Check for an overflow before allocating
• Additional commits viewable in compare view

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