en.javascript.info/1-js/04-object-basics/06-constructor-new/3-accumulator/task.md

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Create new Accumulator

Create a constructor function Accumulator(startingValue).

Object that it creates should:

• Store the "current value" in the property value. The starting value is set to the argument of the constructor startingValue.
• The read() method should use prompt to read a new number and add it to value.

In other words, the value property is the sum of all user-entered values with the initial value startingValue.

Here's the demo of the code:

let accumulator = new Accumulator(1); // initial value 1
accumulator.read(); // adds the user-entered value
accumulator.read(); // adds the user-entered value
alert(accumulator.value); // shows the sum of these values

[demo]