Eval alternative

Question

This code works as a calculator, but the scratch pad at codeacademy tells me that eval is evil. Is there another way to do the same thing without using eval?

Answer 1

You can use the expression parser that is included in the math.js library:

http://mathjs.org

Example usage:

mathjs.evaluate('1.2 / (2.3 + 0.7)');   // 0.4
mathjs.evaluate('5.08 cm in inch');     // 2 inch
mathjs.evaluate('sin(45 deg) ^ 2');     // 0.5
mathjs.evaluate('9 / 3 + 2i');          // 3 + 2i
mathjs.evaluate('det([-1, 2; 3, 1])');  // -7