Conditional

ELI5 — The Vibe Check

A conditional is an if/else decision in your code — 'if this is true, do this; otherwise, do that.' It is how your program makes choices. Is the user logged in? If yes, show the dashboard. If no, redirect to login. Conditionals are the backbone of any logic.

Real Talk

A conditional is a control flow statement that executes different code blocks based on whether a boolean expression evaluates to true or false. Types include if/else, else if chains, switch/case statements, ternary operators (condition ? a : b), and nullish coalescing (?? for null/undefined). Conditionals are how programs express branching logic.

Show Me The Code

// Standard if/else:
if (user.isLoggedIn) {
  showDashboard();
} else if (user.isPending) {
  showPendingScreen();
} else {
  redirectToLogin();
}

// Ternary (one-liner for simple conditions):
const label = isActive ? 'Active' : 'Inactive';

// Nullish coalescing (null or undefined fallback):
const name = user.name ?? 'Anonymous';

When You'll Hear This

"Add a conditional to handle the case where the list is empty." / "That nested conditional is unreadable — simplify it."