Accessing the values in an array of lists of pairs

It's always important to make your data structures right. In this case, they don't feel right, but I guess you are forced to use that format. In any case, I would solve it like this:

for @products.map( { |(.[0].value, .[1].value) } ) -> $name, $price {

In words: map the list with pairs to a Slip (prefix |) with just the values of the pairs, and feed that into $name and $price two elements at a time. Perhaps better readable would be:

for @products.map( { (.[0].value, .[1].value).Slip } ) -> $name, $price {

For the data given, you can use this sub-signature:

for @products -> @ ( :$name, :$price ) {
  say "$name: USD$price"
}

So this expects a single unnamed listy argument @.
It then expounds upon that by saying it contains two named values.
(This works because you have them as Pair objects.)

---

Really what you had was very close to working, all you had to do was coerce to a Hash.

for @products -> $x { say $x.hash{"name"} ~ ": USD" ~ $x.hash{"price"} }

for @products -> Hash() $x { say $x{"name"} ~ ": USD" ~ $x{"price"} }

---

Personally if I were going to do a lot of work with this data I would create an ecosystem for it.

class Product {
  has $.name;
  has $.price;

  our sub from-JSON-list ( @ (:$name, :$price) --> ::?CLASS ) {
    ::?CLASS.new( :$name, :$price )
  }

  method gist ( --> Str ) { "$.name: USD$.price" }
}


@products .= map: &Product::from-JSON-list;

.say for @products;

If you didn't like the & you could create a constant alias to the sub.

…

  constant from-JSON-list =
  our sub from-JSON-list ( @ (:$name, :$price) ) {
    ::?CLASS.new( :$name, :$price )
  }

…

@products .= map: Product::from-JSON-list;

Since raku OO is so lightweight, you could use a class which is a great way to manage non-uniform data structures:

class Product {
    has $.name;
    has $.price;

    method gist { "$.name: USD$.price" }
}

my @products = ( 
    Product.new(name => "samsung s6" , price => "600"),
    Product.new(name => "samsung s6" , price => "600"),
);
.say for @products;

#samsung s6: USD600
#samsung s6: USD600