dusk/test/duskscript/assets/pass_control.ds

// if / else
var result = 0;
if(true) result = 1;
assert(result == 1);
if(false) result = 2; else result = 3;
assert(result == 3);
if(0) { result = 4; } else if(1) { result = 5; } else { result = 6; }
assert(result == 5);
if(null) { result = 7; } else if("") { result = 8; } else { result = 9; }
assert(result == 9);
if(1) {
  if(0) {
    result = 10;
  } else {
    result = 11;
  }
}
assert(result == 11);

// while
var i = 0;
var sum = 0;
while(i < 5) {
  sum += i;
  i++;
}
assert(sum == 10);
assert(i == 5);
while(false) { assert(false); }

// for
sum = 0;
for(var j = 0; j < 10; j++) sum += j;
assert(sum == 45);
sum = 0;
for(var k = 10; k > 0; k -= 3) sum += k;
assert(sum == 10 + 7 + 4 + 1);
var count = 0;
for(;;) {
  count++;
  if(count == 5) break;
}
assert(count == 5);
var outer = 0;
var inner = 0;
for(var a = 0; a < 3; a++) {
  outer++;
  for(var b = 0; b < 4; b++) inner++;
}
assert(outer == 3 && inner == 12);

// break and continue
sum = 0;
for(var m = 0; m < 10; m++) {
  if(m % 2 == 0) continue;
  if(m > 7) break;
  sum += m;
}
assert(sum == 1 + 3 + 5 + 7);
i = 0;
sum = 0;
while(true) {
  i++;
  if(i < 3) continue;
  sum += i;
  if(i >= 5) break;
}
assert(sum == 3 + 4 + 5);

// break only leaves the loop it is in
var pairs = 0;
for(var p = 0; p < 3; p++) {
  for(var q = 0; q < 10; q++) {
    if(q == 2) break;
    pairs++;
  }
}
assert(pairs == 6);

// foreach
sum = 0;
foreach(var v : [1, 2, 3, 4]) sum += v;
assert(sum == 10);
var seen = [];
foreach(var item : ["a", 2, true, null, [1]]) push(seen, item);
assert(len(seen) == 5);
assert(seen[0] == "a" && seen[1] == 2 && seen[2] == true && isnull(seen[3]));
foreach(var nothing : []) assert(false);
sum = 0;
foreach(var w : [1, 2, 3, 4, 5, 6]) {
  if(w == 2) continue;
  if(w == 5) break;
  sum += w;
}
assert(sum == 1 + 3 + 4);
var letters = "";
foreach(var ch : "xyz") letters += ch;
assert(letters == "xyz");
sum = 0;
foreach(var row : [[1, 2], [3, 4]]) {
  foreach(var cell : row) sum += cell;
}
assert(sum == 10);

// Block scope: a variable of a block is gone after it
var shadow = "outer";
{
  var inside = 1;
  assert(inside == 1);
}
assert(shadow == "outer");

// switch
function kind(value) {
  var out = "";
  switch(value) {
    case 1:
      out = "one";
      break;
    case 2:
      out = "two";
      break;
    case "s":
      out = "string";
      break;
    case true:
      out = "bool";
      break;
    default:
      out = "other";
  }
  return out;
}
assert(kind(1) == "one");
assert(kind(2) == "two");
assert(kind("s") == "string");
assert(kind(true) == "bool");
assert(kind(99) == "other");
assert(kind(null) == "other");
assert(kind("1") == "other");

// switch falls through without a break
function fall(value) {
  var trace = "";
  switch(value) {
    case 1:
      trace += "a";
    case 2:
      trace += "b";
      break;
    case 3:
      trace += "c";
  }
  return trace;
}
assert(fall(1) == "ab");
assert(fall(2) == "b");
assert(fall(3) == "c");
assert(fall(4) == "");

// switch in a loop: break leaves the switch, not the loop
var hits = 0;
for(var s = 0; s < 4; s++) {
  switch(s) {
    case 1:
      break;
    default:
      hits++;
  }
}
assert(hits == 3);
// continue inside a switch continues the loop
hits = 0;
for(var t = 0; t < 4; t++) {
  switch(t) {
    case 0:
      continue;
  }
  hits++;
}
assert(hits == 3);

// switch with a default in the middle
function middle(value) {
  switch(value) {
    case 1:
      return "one";
    default:
      return "default";
    case 2:
      return "two";
  }
}
assert(middle(1) == "one");
assert(middle(2) == "two");
assert(middle(3) == "default");