What is the method for avoiding short-circuit conditions in TypeScript?

Is there a way to evaluate conditions in TypeScript without using short-circuiting? TypeScript does not support & or | for boolean types. I need to avoid short-circuit checking because I call the showErrors function inside the isValueValid function.

Consider the following functions:

function isValue1Valid(){
  if(value1 === 0) return true;    
  showErrors1();
  return false;
}

function isValue2Valid(){
  if(value2 === 0) return true;   
  showErrors2();
  return false;
}

Now, when evaluating the condition:

if(isValue1Valid() & isValue2Valid()){
//Submit data
}

Another approach could be:

if(isValue1Valid() & isValue2Valid()){
//Submit data 
   return;
}
showErrors1()
showErrors2()

However, I prefer calling it inside the isValueValid function as I think it's more intuitive to show errors by default whenever there's an error.

Answer №1

If you were wondering how to address your query, one approach could be:

if ([checkValue1(), checkValue2()].every(Boolean)) {
    //Proceed with data submission
}

It's advisable not to have the validateValue function trigger displayError directly. Instead, modify your validation functions so they return error messages, which can then be shown if necessary:

function getErrorMessageForValue1() {
    if (value1 === 0) return null;
    else return "Value 1 must not be empty";
}

function getErrorMessageForValue2() {
    if (value2 === 0) return null; 
    else return "Value 2 should not be zero";
}

// Afterwards:
const errorMessages = [getErrorMessageForValue1(), getErrorMessageForValue2()] // Consider iterating over fields dynamically
if (errorMessages.some(Boolean)) {
    for (let errorMessage of errorMessages)
        displayError(errorMessage);
} else {
    // Proceed with data submission
}

Answer №2

When utilizing functions with side-effects (which is generally not recommended), it is beneficial to be extremely explicit about their invocation and timing:

 var checkValue1 = validateValue1(); // potential message display
   var checkValue2 = validateValue2(); // potential additional messages

   if (checkValue1 && checkValue2) {
        // proceed with data submission
   }

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