如何处理代码中的竞争条件？

Question

In the class below the function result() will display the value of the variable whatToDo accordingly the functions addition and multiplication are called.

Condition : Here, in the below code what if whatTodo is addition but function addition is only not called.

Question : How can I deal this Condition ?

class SomeClass{

let whatToDo: string;

public result(){
        if ( this.whatToDo == 'additon'){
             return this.whatToDo;
           }
        else if (this.whatToDo == 'multiplcation'){
              return this.whatToDo;
}

}
public addition(){
    this.whatToDo = 'addition';
     //do something
}

public multiplication(){
  this.whatToDo = 'multiplication';
     //do something
}
}

Use case - When whatTodo is assigned as addition before calling addition(), so it should tell that whatToDo is undefined so that it can be easily differentiated that addition() is not yet called.This what I want ot achieve.

Answer 1

It looks like just a typo, try:

public result(){
        if ( this.whatToDo == 'addition'){
             return this.whatToDo;
           }
        else if (this.whatToDo == 'multiplication'){
              return this.whatToDo;
}

You misspelled the words "additon" and "multiplcation" in your code.