Gotchas of JavaScript's Number type (C's double)

Question

What are some important considerations for developers using JavaScript's Number type? I know it's an implementation of C's double type, but I'm a self-taught Python developer so that doesn't take me very far. Pointers to well-written articles will be great answers.

Thanks!

Answer 1

In general, it's just the general problems that plague Floating Point based arithmetic. For example, .1 + .2 == 0.30000000000000004 in JavaScript.

A good article on floating point arithmetic in general, and some of the problems associated with it can be found here on Wikipedia.

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Edit: a previous answer to a similar question that seemed to be pretty popular - http://stackoverflow.com/questions/588004/is-javascripts-math-broken/588014#588014