Lesson 4.5: Compound Conditional Statements

Review: Basic Conditional Statements

if (condition) {
  // statement 1
} else {
  // statement 2
}

• Executes statement 1 if the condition is true, otherwise statement 2.

Review: Multiple Conditions

if (condition1) {
  // statement 1
} else if (condition2) {
  // statement 2
} else {
  // statement 3
}

Compound Conditional Statements

Syntax & Concepts

• JavaScript uses && for "and", || for "or".
• && requires both conditions to be true.
• || requires at least one condition to be true.

Example Code Snippets

AND Operator

if (email === "code@cn.org" && password === "123") {
  alert("Log in!");
} else {
  alert("Incorrect!");
}

OR Operator

if (waterTemp < 32 || waterTemp > 212) {
  alert("Don't drink it!");
} else {
  alert("Water is safe!");
}

Nested Conditions

if ((num >= 8 && num >= 6) || num < 10) {
  alert("True");
} else {
  alert("False");
}

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Happy coding! 😊