use in operator to check if character is in string

[davekch]

In the documentation you state

In V, a string is a read-only array of bytes

so it would be intuitive to use the in operator on strings.

Right now,

fn main(){
    mystr := 'abcd'
    if 'a' in mystr {
        println('a is in $mystr')               
    }
}

results in

pass=2 fn=`main`
panic: substring.v:3
`in` requires an array

[ntrel]

First, 'a' is a string, use backticks for (byte) characters (they ought to produce runes instead though).

in is an O(n) operator, so a function would make this clearer (see #277). If we keep in, it needs to be overloadable for structs so the string struct can support it. Even then it can't find both a substring and a byte/rune unless the method takes a generic type.

[alexesprit]

The in operator now can be used for strings.