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void main() {
   var test = compose([add(1), subtract(10)]);
   print(test(2));// 10-2+1=9
}

add(int x) {
  return (int y) => x + y;
}

subtract(int x) {
  return (int y) => x - y;
}

class Compose {
  Function first;
  List<Function> funcs;
  
  Compose(List<Function> funcs) {
    var reversedFuncs = funcs.reversed.toList();
    this.first = reversedFuncs.first;
    this.funcs = reversedFuncs.sublist(1);
  }
  
  call(List<Function> args) {
    var ret = this.first(args);
    for(var f in this.funcs) {
      ret = f(ret);
    }
    return ret;
  }
}

compose(List<Function> funcs) {
  if(funcs == null) {
    return (x) => x;
  }
  
  if(funcs.length == 1) {
    return funcs[0];
  } else {
    return new Compose(funcs);
  }
}