Does the element of the slice have to be a structure

[lirui001]

In my code，i want to use any check slice data，but my slice is about []string，i don't kown how to get element about slice in my expression.

In your example：
type Tweet struct {
Len int
}

type Env struct {
Tweets []Tweet
}

func main() {
code := all(Tweets, {.Len <= 240})

program, err := expr.Compile(code, expr.Env(Env{}))
if err != nil {
	panic(err)
}

env := Env{
	Tweets: []Tweet{{42}, {98}, {69}},
}
output, err := expr.Run(program, env)
if err != nil {
	panic(err)
}

fmt.Println(output)

}

In my example：
type Env struct {
Tweets []int
}

func main() {
code := all(Tweets, {.<= 240})

program, err := expr.Compile(code, expr.Env(Env{}))
if err != nil {
	panic(err)
}

env := Env{
	Tweets: []int{42, 98, 69},
}
output, err := expr.Run(program, env)
if err != nil {
	panic(err)
}

fmt.Println(output)

}

the code compile error：Error compiling expression: expected name

[antonmedv]

Use #