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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
accumulator.read(); // adds the user-entered value
accumulator.read(); // adds the user-entered value
alert(accumulator.value); // shows the sum of these values
Run the demo
Open a sandbox with tests.
function Accumulator(startingValue) {
this.value = startingValue;
this.read = function() {
this.value += +prompt('How much to add?', 0);
};
}
let accumulator = new Accumulator(1);
accumulator.read();
accumulator.read();
alert(accumulator.value);
Open the solution with tests in a sandbox.