Lære Logical Operators | Building Conditions and Repetition

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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Sektion 2. Kapitel 2

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Suggested prompts:

Can you explain how the logical operators work in these examples?

What would happen if all the conditions were set to true?

Can you give more real-life examples using logical operators?

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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.


              123456789
            
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.");
}


              123456789
            
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.");
}

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 2