JavaScript Built-in Constants Infinity and -Infinity
Example
1 / 0; // Infinity // Wait! WHAAAT? Infinity is a property of the global object (therefore a global variable) that represents mathematical infinity. It is a reference to Number.POSITIVE_INFINITY
It is greater than any other value, and you can get it by dividing by 0 or by evaluating the expression of a number that's so big that overflows. This actually means there is no division by 0 errors in JavaScript, there is Infinity!
There is also -Infinity which is mathematical negative infinity, and it's lower than any other value.
To get -Infinity you negate Infinity, or get a reference to it in Number.NEGATIVE_INFINITY.
- (Infinity); // -Infinity Now let's have some fun with examples:
Infinity > 123192310293; // true -Infinity < -123192310293; // true 1 / 0; // Infinity Math.pow(123123123, 9123192391023); // Infinity Number.MAX_VALUE * 2; // Infinity 23 / Infinity; // 0 -Infinity; // -Infinity -Infinity === Number.NEGATIVE_INFINITY; // true -0; // -0 , yes there is a negative 0 in the language 0 === -0; // true 1 / -0; // -Infinity 1 / 0 === 1 / -0; // false Infinity + Infinity; // Infinity var a = 0, b = -0; a === b; // true 1 / a === 1 / b; // false // Try your own! 
