Basic Arithmetic Operations on a String Number

Create a function to perform basic arithmetic operations that includes addition, subtraction, multiplication and division on a string number (e.g. "12 + 24" or "23 - 21" or "12 / 12" or "12 * 21").

Here, we have 1 followed by a space, operator followed by another space and 2. For the challenge, we are going to have only two numbers between 1 valid operator. The return value should be a number.

eval() is not allowed. In case of division, whenever the second number equals "0" return -1.

For example:

"15 / 0"  ➞ -1

Examples

arithmeticOperation("12 + 12") ➞ 24 // 12 + 12 = 24

arithmeticOperation("12 - 12") ➞ 24 // 12 - 12 = 0

arithmeticOperation("12 * 12") ➞ 144 // 12 * 12 = 144

arithmeticOperation("12 / 0") ➞ -1 // 12 / 0 = -1

Notes

• All the inputs are only integers.
• The operators are * - + and /.
• Hint: Think about the single space that appears before and after the arithmetic operator.