Change the behavior of eval() to interpret '%' as 'per 100'

Is there a way to modify eval() so that it replaces % with /100? I have an app where I receive dynamic formulas that need to be evaluated. The problem arises when the formula includes %. For example:

E_LOW%*CT_TOTAL+(1-GQC)

where E_LOW, E_TOTAL, GQC are constants.

For instance:

E_LOW = 10

I expect E_LOW% to be interpreted as 0.10, i.e., E_LOW% = 10/100 = 0.10

Currently, I am encountering the following error:

SyntaxError: Unexpected token *

Please note: The issue does not lie with *. Even attempting eval(E_LOW%) results in the error:

SyntaxError: Unexpected token )

It seems that eval is unable to understand or process anything after the %.

Thank you in advance

javascripttypescriptionic-frameworkeval

Answer №1

To solve this problem, you can substitute the percentage sign % in the calculation string with /100 and then calculate the result.

var E_LOW = 10,
    calculation = 'E_LOW%',
    replaced = calculation.replace(/([a-z_]+)%/gi, '($1/100)'),
    result = eval(replaced);

console.log(replaced);
console.log(result);

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