en.javascript.info/1-js/04-object-basics/04-object-methods/7-calculator/task.md

importance: 5

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Create a calculator

Create an object calculator with three methods:

• read() prompts for two values and saves them as object properties with names a and b respectively.
• sum() returns the sum of saved values.
• mul() multiplies saved values and returns the result.

let calculator = {
  // ... your code ...
};

calculator.read();
alert( calculator.sum() );
alert( calculator.mul() );

[demo]