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boolean(JavaScript Variable data type)

Japanese version.

In JavaScript, one of the data types is the Boolean data type. The Boolean data type is used to represent true or false values. These values are defined as keywords and are case sensitive, with the values being either true or false.
The Boolean data type is commonly used for conditional statements and loops. Here is a simple example of using the Boolean data type:

const a = true;
const b = false;

if (a) {
  console.log("a is true");
} else {
  console.log("a is false");
}

if (b) {
  console.log("b is true");
} else {
  console.log("b is false");
}

In the above example, a is true, so the first conditional statement is executed and "a is true" is logged to the console. b is false, so the second conditional statement is executed and "b is false" is logged to the console.
You can also use comparison operators (=== and !==) that return Boolean values to compare two values. Here is an example of using comparison operator with the Boolean data type:

console.log(10 > 5); // true
console.log(10 < 5); // false
console.log(10 === 10); // true
console.log(10 !== 10); // false

In the above example, the comparison operators are used to compare two values and return a Boolean value. If the comparison operator is true, true is returned. If the comparison operator is false, false is returned.

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JavaScript
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