FAQ: Classes - Methods


This community-built FAQ covers the “Methods” exercise from the lesson “Classes”.

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This exercise can be found in the following Codecademy content:

Web Development

Introduction To JavaScript

FAQs on the exercise Methods

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For the final step, I’m not sure how to call the method

takeVacationDays(daysOff) {
    this._remainingVacationDays -= this.daysOff

I created.


takeVacationDays(daysOff) {
   this._remainingVacationDays -= daysOff


First create an instance of the class.

const surgeonCurry = new Surgeon('Curry', 'Cardiovascular');

Then call the method to subtract days taken off…


and finally, poll the remaining days…

console.log(surgeonCurry.remainingVacationDays);    //  6


Can I use this method?

takeVacationDays(daysOff) {
    this._remainingVacationDays - daysOff;

instead of this?

takeVacationDays(daysOff) { 
this._remainingVacationDays -= daysOff


No, because that is an expression, not a statement, and nothing happens to the attribute value.

The second example IS a statement that assigns a new value to the attribute.


Ohhh I see!:grinning::grinning:
Thank you for the fast reply!


Why is the following code does not work for me?
I tried to run:
this._remainingVacationDays-daysOff = this._remainingVacationDays;
Isn’t is supposed to be the same as:
this._remainingVacationDays -= daysOff


The evalauation should not be on the left side of the assignment.

a = a - b
a -= b