Live Coding

example.js

// Write a function that takes an object. The object contains a left, right and operator properties. The left and right properties are numbers. The operator property is a string. The function should return the result of the operation. The function should return null if the operator is not one of the following: +, -, *, /.
// Example:
// calculate({ left: 1, right: 2, operator: '+' }) // 3
// calculate({ left: 1, right: 2, operator: '-' }) // -1
// calculate({ left: 1, right: 2, operator: '*' }) // 2
// calculate({ left: 1, right: 2, operator: '/' }) // 0.5
// calculate({ left: 1, right: 2, operator: '%' }) // null