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Contents
This is the first test for this exercise:
```javascript
it('is not very common', function() {
var year = new Year(2015);
expect(year.isLeap()).toBe(false);
});
```
Each test in the exercise follows the same pattern:
1. A new Year is instantiated with a value and stored in a variable: year.
2. The test calls an instance method, isLeap(), from the variable `year`.
The `Year` function is a constructor, which means that it is specifically designed to provide a template for new objects.
When a new `Year` object is created:
```javascript
var year = new Year(2015);
```
We expect `year` to, at the very least, have a specific value (in this case 2015) assigned to it. Otherwise it would not represent an actual year.
This means that we must store the value passed as a parameter when the new `Year` is created (2015), so that the new `Year` can access it.
The way a constructor stores these fundamental values (instance variables) is like this:
```javascript
var Constructor = function(input) {
this.value = input;
};
```
The `this` in the constructor refers to the newly created instance of the `Constructor`.
Once the input (parameter) is stored in an instance variable, any instance methods, such as:
```javascript
Constructor.prototype.instanceMethod = function() {
// this method can now access the input by calling `this.value`
};
```
The instance method accesses the input using `this.value` (in this example).
This is why code needs to be written in two separate functions:
1. The first function, `Year`, is a constructor that serves as a template for year objects that are created with their value (such as 2015).
This function needs to store the input when a new `Year` is created.
2. The second function, isLeap(), is an instance method that is called from a new `year`.
This function (method) should contain the logic to determine if the given year is a leap year.
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