Ask HN: Great programming language features, other languages should steal?

Post by Jtsummers » Thu, Jul 16, 2020, 7:28 PM UTC

Foober223 wrote: post #20

dfalzone wrote: post #15

This is pretty minor but I like how in Rust you can use constructs like if-statements and match-statements as expressions. For example: let foo = if some_condition { "condition is true" } else { "condition is false" }; let bar = match x { 0 => "string", 1 => "another string", _ => "default" }; It's not super significant but I think it's an elegant syntactic feature.

They got that from lisp. But in lisp it's more than just a syntax trick that only works for a few predefined cases.

Post by kazinator » Thu, Jul 16, 2020, 7:36 PM UTC

dfalzone wrote: post #15

This is pretty minor but I like how in Rust you can use constructs like if-statements and match-statements as expressions. For example: let foo = if some_condition { "condition is true" } else { "condition is false" }; let bar = match x { 0 => "string", 1 => "another string", _ => "default" }; It's not super significant but I think it's an elegant syntactic feature.

  ({ expr1; expr2; ... ; exprN })

  #include 
  
  int main(int argc, char **argv)
  {
    char *foo = (argc > 1) ? ({
                  printf("consequent\n");
                  "condition is true: I have arguments";
                }) : ({
                  printf("alternative\n");
                  "condition is false: I don't have arguments";
                });
    puts(foo);
  }

  #include 

  #define ifblock(expr) (expr) ? (
  #define elseblock ) : (
  #define endblock )

  int main(int argc, char **argv)
  {
    char *foo = ifblock (argc > 1) {
                  printf("consequent\n");
                  "condition is true: I have arguments";
                } elseblock {
                  printf("alternative\n");
                  "condition is false: I don't have arguments";
                } endblock;
    puts(foo);
  }

Post by dTal » Thu, Jul 16, 2020, 7:42 PM UTC

Post by kmatthewc » Thu, Jul 16, 2020, 7:54 PM UTC

Post by [deleted] » Thu, Jul 16, 2020, 7:54 PM UTC