=== Program ===
// copied from K: tests/diverse/higher-order.simple
var x, a[10];

function incx() {
  ++x;
}

function zero() {
  return 0;
}

function id(x) {
  return x;
}

function double(x) {
  return 2*x;
}

function hoincx() {
  return incx;
}

function hozero() {
  return zero;
}

function hoid() {
  return id;
}

function hodouble() {
  return double;
}

function app0(f) {
  f();
}

function app1(f) {
  return f();
}

function app2(f,x) {
  return f(x);
}

function map(f,x) {
  for (var i = 0; i <= sizeOf(x) - 1; ++i) {
    x[i] = app2(f,x[i]);
  }
}

function printall() {
  print("x = ",x, ";  a[] = ");
  for (var i = 0; i <= sizeOf(a) - 1; ++i) {
    print(a[i], " ");
  }
  print("\n");
}

function main() {
  x = 0; var i;
  for (var i=0; i <= sizeOf(a) - 1; ++i) {
    a[i]=i;
  }
  printall();
  hoincx()();
  print(x," ", hozero()()," ", hoid()(7)," ", hodouble()(7),"\n");
  id(hoincx())();
  print(x," ", id(hozero())()," ", 
        id(hoid())(7)," ", id(hodouble())(7),"\n");
  app0(id(hoincx()));
  print(x," ", app1(id(hozero()))," ", 
        app2(id(hoid()),7)," ", app2(id(hodouble()),7),"\n");
  map(double,a);
  printall();
}
=== Output ===
Result:
null-value

Output Entity: standard-out
"x = ",0,";  a[] = ",0," ",1," ",2," ",3," ",4," ",5," ",6," ",7," ",8," ",9," ","\n",1," ",0," ",7," ",14,"\n",2," ",0," ",7," ",14,"\n",3," ",0," ",7," ",14,"\n","x = ",3,";  a[] = ",0," ",2," ",4," ",6," ",8," ",10," ",12," ",14," ",16," ",18," ","\n"