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3.1 Numbers

Unlike many languages, JavaScript does not make a distinction between integer values
and floating-point values. All numbers in JavaScript are represented as floating-point
values. JavaScript represents numbers using the 64-bit floating-point format defined
by the IEEE 754 standard,
1
 which means it can represent numbers as large as
±1.7976931348623157 × 10308 and as small as ±5 × 10−324.
The JavaScript number format allows you to exactly represent all integers between
−9007199254740992 (−253) and 9007199254740992 (253), inclusive. If you use integer
values larger than this, you may lose precision in the trailing digits. Note, however, that
certain operations in JavaScript (such as array indexing and the bitwise operators de-
scribed in Chapter 4) are performed with 32-bit integers.
When a number appears directly in a JavaScript program, it’s called a numeric literal.
JavaScript supports numeric literals in several formats, as described in the following
sections. Note that any numeric literal can be preceded by a minus sign (-) to make the
number negative. Technically, however, - is the unary negation operator (see Chap-
ter 4) and is not part of the numeric literal syntax.

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