Programming Basics - JavaScript: Novice to Ninja - page 44

There is also a value -Infinity , which is used for negative numbers that go below
-1.7976931348623157e+308:
-1e309;
<< -Infinity
The value of Infinity can also be obtained by dividing by zero:
1/0;
<< Infinity
The smallest number that JavaScript can deal with is 5e-324. Anything below this evaluates
to either 5e-324 or zero:
5e-324;
<< 5e-324
3e-325;
<< 5e-324
2e-325;
<< 0
NaN
NaN is an error value that is short for "Not a Number". It is used when an operation is at-
tempted and the result isn't numerical:
"hello" * 5;
<< NaN
The result returned by the typeof operator is rather ironic, however:
typeof Nan;
<< 'number'