Conditions

What this means

Conditions use values such as true and false to decide which block of code should run. JavaScript commonly uses if, else, comparison operators, and logical operators.

In beginner terms, this topic answers one practical question: "What should I write, and why does React care about it?" Do not try to memorize the syntax first. First understand the idea, then connect the syntax to that idea.

Why it matters

Apps constantly make decisions: show login or dashboard, accept or reject input, and display success or error messages.

When you build real React screens, this idea helps you decide where data should live, what the user should see, and what should happen after an interaction. That is why this lesson is part of the main path instead of being an optional detail.

Step by step

1. Notice the UI problem this topic solves. 2. Look at the smallest possible example. 3. Change one value and predict what should appear. 4. Run the example and compare the result with your prediction. 5. Use the practice task before moving on.

Small example

if (score >= 70) {
  console.log("Passed");
} else {
  console.log("Try again");
}

Common mistake

Do not confuse assignment = with comparison operators such as ===.

Practice task

Create a score variable and show either Passed or Keep practicing.

Remember this

Conditions turn data into decisions.