\n

Double precision, 64bit IEEE 754.
Internally stored as a floating point number.
Divided into three components, the fraction is 52 bits(bits 0 > 51), the exponent is 11 bits (52 > 62) and then 1 bit for the sign.
The hightest integer that can be stored is 2^53.
Othwise numbers are stored as a fraction times 2^exponent

\n

This means that, when performing integer calculations, the results are always accurate, however, when performing calculations with fractions the numbers are fractional.

\n

\n

e.g.

\n

\n

0.1 + 0.2 != 0.3 The result will be 0.30000000000000004.

\n

\n

A solution to this is to truncate the result.

\n

Getting started with JavaScript