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JavaScript JavaScript Functions Create Reusable Code with Functions Using Multiple return Statements

Adrian Rojas-Baez
Adrian Rojas-Baez
3,672 Points
Posted by Adrian Rojas-Baez
Adrian Rojas-Baez
3,672 Points

Why does the statement if (fieldTest) { } return true? Does if(x) {} always return a true statement?

function isFieldEmpty() { const field = document.querySelector('#info'); if (!field.value) { // if (field.value === '') is the same as if (!field.value) return true; } else { return false; } }

const fieldTest = isFieldEmpty();

if (fieldTest) { alert('Please provide your information.'); }

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

The statement if (x) will test the value of "x", whatever it may be. In this case, it is being used to check the value of the HTML field with the ID of "info", which will be "falsey" when it is empty.

Also, you don't need to test a value if you are only going to return it, so this code:

  if (!field.value) {
    return true;
  } else {
    return false;
  }

... can be simplified to just this:

  return !field.value;