N Number (Type) There are special constants (Web hosting domain)
N Number (Type) There are special constants for the values Infinityand NaN. The Infinity value can be positive or negative. The NaN value represents a quantity that is known to be numeric but is not a valid value for the implementation. It can be tested for with the isNaN() function. See also: Cast operator, Floating constant, Infinity, isNaN(), JavaScript to Java values, Number.MAX_VALUE, Number.MIN_VALUE, Primitive value Cross-references: ECMA 262 edition 2 section 4.3.19 ECMA 262 edition 3 section 4.3.19 Wrox Instant JavaScript page 14 Number (Type) A native built-in type. Availability: Property/method value type: ECMAScript edition 2 Number primitive The number type defines objects that represent numbers and include the IEEE 754 NaN values in the set if the implementation is fully ECMA-compliant. The number range is huge, representing the double precision 64 bit IEEE 754 set of values. The IEEE 754 standard defines a large number of values that are considered to be not an actual number, and should be represented as NaN. Some implementations of IEEE 754 allow you to tell the difference between an overflow error and a divide by zero error. In JavaScript, all of these values are represented by a single NaNvalue and you cannot distinguish between them. The JavaScript NaN value is globally defined as a variable. The Numbertype includes the values positive and negative Infinity and, internally at least, positive and negative zero are represented as two distinct values. Cast operator, Data Type, Floating point, Fundamental data type, Hexadecimal value, IEEE 754, Infinity, Integer, NaN, Octal value, Primitive value, ToBoolean, ToInt32, ToNumber, ToObject, ToPrimitive, ToUint16, ToUint32, Type, Type conversion, valueOf() See also: Cross-references: ECMA 262 edition 2 section 4.3.19 ECMA 262 edition 2 section 8.5 ECMA 262 edition 3 section 4.3.20 ECMA 262 edition 3 section 8.5 O’Reilly JavaScript Definitive Guide page 34 1549