Create an extendable calculator

Create a constructor function Calculator that creates "extendable" calculator objects.

The task consists of two parts.

First, implement the method calculate(str) that takes a string like "1 + 2" in the format "NUMBER operator NUMBER" (space-delimited) and returns the result. Should understand plus + and minus -.

Usage example:
```
let calc = new Calculator;

alert( calc.calculate("3 + 7") ); // 10
```

Then add the method addOperator(name, func) that teaches the calculator a new operation. It takes the operator name and the two-argument function func(a,b) that implements it.

For instance, let's add the multiplication *, division / and power **:

let powerCalc = new Calculator;
powerCalc.addMethod("*", (a, b) => a * b);
powerCalc.addMethod("/", (a, b) => a / b);
powerCalc.addMethod("**", (a, b) => a ** b);

let result = powerCalc.calculate("2 ** 3");
alert( result ); // 8

No brackets or complex expressions in this task.
The numbers and the operator are delimited with exactly one space.
There may be error handling if you'd like to add it.

1.2 KiB Raw Blame History

Create an extendable calculator

1.2 KiB

Raw Blame History