Page 168 - JavaScript

Perhaps confusingly, NaN is still considered a number.

typeof NaN; // 'number'

Don't check for NaN using the equality operator. See isNaN instead.

NaN == NaN // false
NaN === NaN // false

Number constants

The Number constructor has some built in constants that can be useful

Number.MAX_VALUE; // 1.7976931348623157e+308
Number.MAX_SAFE_INTEGER; // 9007199254740991

Number.MIN_VALUE; // 5e-324
Number.MIN_SAFE_INTEGER; // -9007199254740991

Number.EPSILON; // 0.0000000000000002220446049250313

Number.POSITIVE_INFINITY; // Infinity
Number.NEGATIVE_INFINITY; // -Infinity

Number.NaN; // NaN

In many cases the various operators in Javascript will break with values outside the range of (
Number.MIN_SAFE_INTEGER, Number.MAX_SAFE_INTEGER)

Note that Number.EPSILON represents the different between one and the smallest Number greater than
one, and thus the smallest possible difference between two different Number values. One reason to
use this is due to the nature of how numbers are stored by JavaScript see Check the equality of
two numbers

Read Built-in Constants online: https://riptutorial.com/javascript/topic/700/built-in-constants

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