学ぶ Logical Operators | Building Conditions and Repetition

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Imagine you want to decide whether to go outside. You might think: "I'll go out if it's sunny and warm, or if it's not raining." This everyday reasoning is very similar to how you combine conditions in JavaScript using logical operators.

The && operator means and, both conditions must be true;
The || operator means or, at least one condition must be true;
The ! operator means not, it flips a condition to its opposite.


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let isSunny = true;
let isWarm = false;
let isRaining = false;

if ((isSunny && isWarm) || !isRaining) {
  console.log("You can go outside!");
} else {
  console.log("Better stay indoors.");
}


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let isSunny = false;
let isWarm = true;
let isRaining = true;

if ((isSunny && isWarm) || !isRaining) {
  console.log("You can go outside!");
} else {
  console.log("Better stay indoors.");
}

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セクション 2. 章 2

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セクション 2. 章 2