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Editorial Team
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Asked: 2026-06-02T05:24:59+00:00

In my app I need to allow users to do calculations such as add/subtract/divide

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In my app I need to allow users to do calculations such as add/subtract/divide values from rows in different tables. Is there a safer way to do this than using eval()? Is it better to take a string as an input and write my own functions to parse the string to do calculations?

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1 Answer

  1. Editorial Team

    just filter out the non digits and non operands

    var1 = "4+4;haha i'm a nasty command"
var1.gsub!(/[^\d|\+-\/\*]/,"")
p eval(var1) => 8
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