dart

closure.dart

Function makeMultiplier(num multiplyBy) {
  return (num i) => multiplyBy * i;
}
Function makeAdder(num addBy, num addByOther) {
  return (num i, num j) => addBy + addByOther + i + j;
}

Function makeAdderAndMultiplier(num addBy, num multiplyBy) {
  var f = makeMultiplier(multiplyBy);
  num res = f(2);
  return (num i) => addBy + res + i;
}

void main() {
  
  var add2 = makeAdder(2,0);
  var add2plus2plus1 = makeAdder(add2(2,1),0);
  var add4minus1 = makeAdder(4,-1);
  var wut = makeAdder(add4minus1(3,-1),add2(3,5));
  var aaa = makeAdderAndMultiplier(0,10);
  
  print(add2(3,0));
  print(add4minus1(1,0));
  print(add2(2,0));
  print(add2plus2plus1(-1,0));
  print(wut(0,0));
  print('   ');
  print(aaa(0));
  
}