Build a Leap Year Calculator - Build a Leap Year Calculator

Curriculum Help
1

Tell us what’s happening:

I think this code can work, but the result is different

Your code so far

function isLeapYear(year){
  const isLeap = year % 400 === 0 || year % 4 === 0 && 100 !== 0;
  return `${year} ${isLeap ? 'is ':'is not '}a leap year.`;
}

const year = 1900;

const result = isLeapYear(year);

console.log(result);

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0

Challenge Information:

Build a Leap Year Calculator - Build a Leap Year Calculator

GitHub Link: freeCodeCamp/curriculum/challenges/english/blocks/lab-leap-year-calculator/66c06fad3475cd92421b9ac2.md at main · freeCodeCamp/freeCodeCamp · GitHub

2

consider in what order do you want these expressions to run

and then consider what is the relative priority of || vs &&

3

is relative priority like operator precedence ?

4

Yes, relative priority is like operator precedence.

5

I think the phrase year % doesn’t necessarily have to be repeated after the 100. It’s similar to the use of “and” in formal language. for example : If “I want to buy coffee and bread”, I don’t need to repeat “I want to buy” before the word “bread”. Is that correct ?

6

that’s not correct, you are doing once year % 400 and once year % 4, if you remove the % you are not using it anymore

I suggest you focus on && and ||

7

but now the code is work with && year % 100 without worrying about operator precedence hhe. the order of operator precedence begin first with && and next with ||. is that correct ?

8

yes, the order in which this code runs:
year % 400 === 0 || year % 4 === 0 && 100 !== 0

is

(year % 400 === 0) || (year % 4 === 0 && 100 !== 0)

when in doubt you can use brackets so the expressions go in the order you want for sure