How to do random action with numbers?

Question

Hello friends, nice to read you. How to do this?
(it's work like string, but how to make the equation?)
https://code.sololearn.com/WmsdTkZ9i95E/?ref=app

Answer 1

the +-×÷ you set is characters, cannot directly use for math operators. Use switch operator to help you choose the correct math operation.

Answer 2

Use if..else to evaluate which random operator string returned, then do the math as necessary, depending on the operator returned.

if(action==="+")
// add a & b
...