As far as I know, Expr only has the ternary statement:

valueA != valueB ? do-if-true : do-if-false

It's in the Operators.

Yeap. But I do want to implement if statements as well.

If it could support control flow and custom functions, that would be great.

maybe we can implement a simple "pattern matching" first?

match a {
 1 -> "foo"
 2 -> "bar"
 default -> "none"
}

or

switch {
case <condition 1> -> "foo"
case <condition 2> -> "bar"
default -> "none"
}

something like aboves is really help

BTW: currently I use go template + sprig for implement my business logic, it's too heavy and a bit slow than expr. The blocker of my expr migration is if statement or pattern matching.

Would greatly benefit control flow as well. Either switch case or if/else are good options for my use-cases. I can work around with ternary however, just less practical.

@antonmedv Any plans on having if-else in near future? It's easier for business folks as well to use

I'm facing a scenario where if-else proves very helpful, consider this script:

if input1 != "" {
 return input1
}
b := calculateB(input2);
c := calculateC();
return getResult(b, c);

To do this in go expr, I'm currently planning to write this:

let b = input1 == "" ? calculateB(input2) : nil;
let c = input1 == "" ? calculateC() : nil;
input1 != "" ? input1 : getResult(b, c)

It would be so much nicer if the expression language has a "return" keyword, or a rust-like if-else expression:

if input1 != "" {
 input1
} else {
 let b = calculateB(input2);
 let c = calculateC();
 getResult(b, c)
}

I would say this is easier to read.

Hey folks - excited that this is now merged! Is there a timeline for the next release?