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I have this "2+2" and "(2+5)*2" in JS and wanted convert them into int and calculate to get the result of 4 and 14 respectively. So, concerning the research done, I found convert string to integer and calculate which offers to use eval() which hits performance therefore I wanted to kindly ask what is the right way to convert "2+2" and "(2+5)*2" into int to calculate?

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  • Other than using eval (which you shouldn't for both performance and security reasons), you can only write your own String parser. I'd do neither and make sure I don't have such strings to work with. Commented Apr 5, 2020 at 14:51
  • Can you elaborate on why you have been given this task? Is it a school assignment? Commented Apr 5, 2020 at 14:51
  • Although you can use eval for this but it is not a good practice to use eval and it has a lot of security issues unless you are sure your string does consist of operators and digits. For eval you can use this: let calculated = eval('2+2'); But if not it is better to separate digits and operators via regex and then do the operation. Commented Apr 5, 2020 at 14:55
  • @JLRishe, no I was creating calculator in React and wanted to convert that string to something that can be calculated and show the result:) Commented Apr 5, 2020 at 14:57
  • @connexo, thank you for your comments, what do you think about math.js. Is it ok to use that? Commented Apr 5, 2020 at 14:59

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You are using eval() correctly in this case as that is what is made for. As per @yckart in this answer, he used the function constructor to evaluate.

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