Create new Accumulator
الأهمية: 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 constructorstartingValue
. - The
read()
method should useprompt
to read a new number and add it tovalue
.
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
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);