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Create new Accumulator

importance: 5

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; // adds the user-entered value; // adds the user-entered value
alert(accumulator.value); // shows the sum of these values

Run the demo

Open the sandbox with tests.

function Accumulator(startingValue) {
  this.value = startingValue; = function() {
    this.value += +prompt('How much to add?', 0);


let accumulator = new Accumulator(1);;;

Open the solution with tests in the sandbox.