Possible Javascript numerical bug [duplicate]

Question

This question already has answers here:

Is floating point math broken? (32 answers)

Closed 8 years ago.

This code snippet:

Math.pow(10,20)+20000 == Math.pow(10,20) + 10000

evaluates to true. Is this a JS bug?

Answer 1

No. Javascript uses floating point numbers to represent large values, and the value 10²⁰ exceeds the precision of the floating point numbers. When you add a relatively tiny value such as 20000 or 10000 to the result, the resulting sums are indistinguishable.