学ぶ Logical Operators in Practice | Numbers Booleans and Core Primitives

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const isLoggedIn = true;
const hasTwoFactorAuth = false;

if (isLoggedIn && hasTwoFactorAuth) {
  console.log("Access granted: User is fully authenticated.");
} else {
  console.log("Access denied: Please complete authentication.");
}

When you work with real-world applications, you often need to make decisions based on multiple conditions. Logical operators help you combine or modify boolean values to create more complex decision rules. The three core logical operators in JavaScript are AND (&&), OR (||), and NOT (!). The AND (&&) operator returns true only if both conditions are true; this is useful when you want to require multiple checks, such as making sure a user is both logged in and has completed two-factor authentication. The OR (||) operator returns true if at least one of the conditions is true, which is helpful for scenarios where you want to allow access if any one of several requirements is met. The NOT (!) operator reverses the truthiness of a value, allowing you to check for the opposite of a condition, such as denying access if a user is not verified.

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セクション 2. 章 4

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セクション 2. 章 4