Number of bits in Javascript numbers

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Number of bits in Javascript numbers

rated 0 times [ 78] [ 5] / answers: 1 / hits: 26087 / 14 Years ago, mon, may 10, 2010, 12:00:00

I work in Javascript with integer numbers only (mainly adding numbers and shifting them). I wonder how big they can be without loosing any bits.

For example, how big X can be such that 1 << X will represent 2^X ?

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All numbers in JavaScript are actually IEEE-754 compliant floating-point doubles. These have a 53-bit mantissa which should mean that any integer value with a magnitude of approximately 9 quadrillion or less -- more specifically, 9,007,199,254,740,991 -- will be represented accurately.

NOTICE: in 2018 main browsers and NodeJS are working also with the new Javascript's primitive-type, BigInt, solving the problems with integer value magnitude.

[#96826] Friday, May 7, 2010, 14 Years [reply] [flag answer]

answered 14 Years ago

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