How to convert a string of array value to perform math operation in javascript

Question

I am getting an array value after an operation.

let data = formula.map(a => typeof a === 'number' ? result[index++] : a)

My output that I am getting is

data=["6.9","+","7.1","-","3.0"]

I wanted to perform normal math operation on this data like 6.9+7.1-3.0 so my end output will be

endresult = 11

`eval(data.join(''))` although there is security risk associated to it. please refer : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval#Never_use_eval! — gorak, Jun 16 '20 at 06:09
What math operations do you consider normal? addition, subtraction, multiplication, divsion and modulus? `+, - * / %` — apena, Jun 16 '20 at 06:47

score 2 · Answer 1 · answered Jun 16 '20 at 06:12

2

You can use eval and pass a string into it. To create a string from the array you can use join().

var data=["6.9","+","7.1","-","3.0"];

var data1=["6.9","+","7.1","*","3.0"];

console.log(eval(data.join('')));
console.log(eval(data1.join('')));

answered Jun 16 '20 at 06:12

Rajan

1 Answers1