JS-043
Educational JavaScript lesson graphic for if: Learn to run code only when a condition returns true
Beginner4 min~4 min read#if#condition#control-flow

if

Run code when a condition is true

Goal

Learn to run code only when a condition returns true.

Explanation

  • if is the basic decision-making statement in JavaScript.
  • First, the condition inside the parentheses is checked.
  • If the result is true, the code runs.
  • If the result is false, the code is skipped.
  • if is the foundation of almost all program logic.

Analogy

If it is sunny outside, you go for a walk. Otherwise, you do nothing. That is exactly how if works.

Code

if (isSunny) {
  console.log("Go outside");
}

Result: Go outside

Common mistake

Beginners often think the code inside if always runs. It actually runs only when the condition is true.

Remember

  • ✦ if checks a condition.
  • ✦ The code runs only when the condition is true.
  • ✦ When the condition is false, the block is skipped.

Quick Quiz

When does the code inside an if statement run?

Resources