Question
Answer and Explanation
In JavaScript, the concept of "infinity" is represented by the global property Infinity
. When we refer to "js infinity", we are generally talking about this specific property. Therefore, the question of whether "js infinity" is equal to "infinity" boils down to whether the JavaScript representation of infinity, denoted as Infinity
, is equal to itself. The answer is yes, Infinity === Infinity
will evaluate to true
in JavaScript.
Let's delve deeper into understanding how JavaScript handles the concept of infinity:
1. The Infinity
Property:
- JavaScript has a built-in global property named Infinity
that represents the mathematical concept of positive infinity. It's a special numeric value that's greater than any other number. Similarly, -Infinity
represents negative infinity.
2. Use Cases of Infinity:
- Infinity often appears as a result of mathematical operations where a number approaches an undefined limit, such as dividing by zero (e.g., 1 / 0
results in Infinity
) or when a number exceeds the maximum representable value.
3. Comparison with Infinity:
- Comparing Infinity
with itself using the strict equality operator (===
) will return true
because they both refer to the same concept and numerical representation of positive infinity. Any numeric value, other than Infinity
itself, will be less than Infinity
.
4. Example Code:
console.log(Infinity === Infinity); // Output: true
console.log(1 / 0); // Output: Infinity
console.log(Infinity > 1000000); // Output: true
console.log(Infinity > Infinity); // Output: false
console.log(-Infinity < -100); //Output: true
5. Important Note Regarding NaN
:
- It's crucial to note that NaN
(Not a Number) is not equal to itself. NaN === NaN
evaluates to false
. This is because NaN
represents an invalid numerical result, and any comparison with NaN
, even with another NaN
, is not considered to be equal.
In summary, in JavaScript, Infinity
is a special numeric value representing positive infinity, and when compared with itself using the strict equality operator, it evaluates to true
. So, when we say "js infinity" is equal to "infinity," we mean Infinity === Infinity
will return true
, confirming the equality within the JavaScript environment.