What method to use besides eval() on calculator

Question

I just stumbled upon a Q&A forum and one of the comments their is don't use eval() because it makes the browser slower and other consequences. What should I use instead?

Answer 1

You should implement your own function to evaluate expressions.

Answer 2

Using eval, the browser will be slower, but not for all (slower mostly for drawings).
And eval is the best solution for creating a calculator!

Answer 3

michal , your answer gives me an idea. Thanks

Answer 4

Writing your own function isn't something easy : there are lot of conditions, and it can become as slower as the eval function...

Answer 5

Théophile what do you propose to use?

Answer 6

Just use eval... No idea. I'm looking for something else in internet. If I find something, I tell you.

Answer 7

The problem with eval is that a malicious user might input some bad code and let it evaluate.

Answer 8

So, Is there an other function that works like eval?