Does JavaScript have double floating point number precision?

Question

I know it's an odd question, but does JavaScript have the capacity to work with double's as opposed to single floats? (64 bit floats vs. 32 bits.)

Answer 1

All numbers in JavaScript are 64-bit floating point numbers.

Ref:

http://www.hunlock.com/blogs/The_Complete_Javascript_Number_Reference

http://www.crockford.com/javascript/survey.html

Answer 2

According to the ECMA-262 specification (ECMAScript is the specification for Javascript), section 8.5:

The Number type has exactly 18437736874454810627 (that is, 2⁶⁴−2⁵³+3) values, representing the double-precision 64-bit format IEEE 754 values as specified in the IEEE Standard for Binary Floating-Point Arithmetic

Source: http://www.ecma-international.org/publications/files/ecma-st/ECMA-262.pdf (PDF)