arrived at 
array[0]test1 = 2
array[0]test3 = 35
array[0]test5 = 10 

I have formula in string coming from DB as string 
i.e. "array[0]test1 + array[0]test3 * array[0]test5" it in in formulaFromDB variable

 

    formulaFromDB = array[0]test1 + array[0]test3 * array[0]test5

is there any way to get result i.e. 352 in js directly. like any way to load values and get math done