What is the correct way to specify `javascript if multiple conditions`?

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Encapsulate Conditions in a Helper Function for Clarity & Reuse

Taking it one step further—if your logic is even moderately complex or reused, the best practice for managing javascript if multiple conditions is to wrap them in a function:

function needsPageCountUpdate(type, count) {
  return type === 2 && (count === 0 || count === '');
}

if (needsPageCountUpdate(Type, PageCount)) {
  PageCount = document.getElementById('<%=hfPageCount.ClientID %>').value;
}

Why this is better:

  • The if block becomes self-explanatory at a glance.
  • Logic is centralized—easy to test and reuse.
  • Your code stays clean and focused on what it does, not how.

In short, this is a scalable and elegant way to manage javascript if multiple conditions in any project with growing complexity.