Myujth

I am working on Exercism's JavaScript practice 2nd exercise to find out which years are leap year or not.

const isLeap = (year) => 

 if (year % 400 === 0) 
 return true
 else if (year % 4 === 0 && year % 100 !== 0) 
 return true
 else 
 return false
 


console.log(isLeap(2015))
console.log(isLeap(2016))
console.log(isLeap(2100))
console.log(isLeap(2000))
console.log(isLeap(1800))

and when I run the test of the following:

import isLeap from './leap';

describe('A leap year', () => 
 test('year not divisible by 4: common year', () => 
 expect(isLeap(2015)).toBeFalsy();
 );

 xtest('year divisible by 4, not divisible by 100: leap year', () => 
 expect(isLeap(2016)).toBeTruthy();
 );

 xtest('year divisible by 100, not divisible by 400: common year', () => 
 expect(isLeap(2100)).toBeFalsy();
 );

 xtest('year divisible by 400: leap year', () => 
 expect(isLeap(2000)).toBeTruthy();
 );

 xtest('year divisible by 200, not divisible by 400: common year', () => 
 expect(isLeap(1800)).toBeFalsy();
 );
);

It gave an error message of
TypeError: (0 , _leap.isLeap) is not a function

I ran through my conditional logic, and everything seems to be fine. I declared isLeap function via fat arrow function, but the error saying it is not a function. Am I missing something?

You're not exporting the function from the file. You need to:

export const isLeap = () => ...

while declaring, or

export isLeap 

after declaring