Sourced from github.com/expr-lang/expr's releases.

v1.17.0

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

program, err := expr.Compile(`let foo = bar(); baz(foo, foo)`)

In this release:

This release added the biggest change to the Expr language: if-else expressions and sequential expressions. #736 e750878

if foo > 42 {
    assert(foo);
    calc(foo, foo / 2)
} else {
    calc(0, 0)
}

A sequence of expression may be separated by ; char. The last semicolon must be omitted. Expr returns the value of the last expression in the sequence.

If-else is also expressions. Each if must have an else part. Result of if-else can be used as an expression:

let foo = if bar > 0 {
    process(bar)
} else {
    fallback()
};
foo + 42

Added:

• Added ast.Find helper for easy AST searching. 579de74
• Added compile node budget and memory limits (#762)
• Added uniq() builtin (#705)
• Added flatten() builtin (#684)
• Added types pkg (#665 #667 #668)

Improvements:

• Allow tailing comma in arguments (#623)
• Improved type checker for named types 6fa83ad
• Now len() return runes count for string e8bd7f8

... (truncated)

• 3be6386 Code style: remove repeated helper functions
• 25690fe chore: Added SOLO to the companies list (#769)
• a9cda30 Test for issue 756
• 2bc0eed Remove duplicated dereferences
• f4bbea5 Add support deref in all builtins
• 7d564c0 Remove print
• 80f0ea6 Correctly add OpDeref if needed
• 2d9f616 Add more tailing comma tests
• 8f83203 Allow tailing comma in arguments (#623)
• 435b79d Make sure get() returns nil for map[string]string on missing keys
• Additional commits viewable in compare view

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