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JavaScript: Find out the last day of a month

JavaScript Datetime: Exercise-9 with Solution

Write a JavaScript function to get the last day of a month.

Test Data:
console.log(lastday(2014,0));
console.log(lastday(2014,1));
console.log(lastday(2014,11));
Output :
31
28
31

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Find out the last day of a month</title>
</head>
<body>
</body>
</html>

JavaScript Code:

var lastday = function(y,m){
return  new Date(y, m +1, 0).getDate();
}
console.log(lastday(2014,0));
console.log(lastday(2014,1));
console.log(lastday(2014,11));

Sample Output:

31
28
31

Flowchart:

Flowchart: JavaScript- Find out the last day of a month

Live Demo:

See the Pen JavaScript - Find out the last day of a month-date-ex- 9 by w3resource (@w3resource) on CodePen.


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Next: Write a JavaScript function to calculate 'yesterday day'.

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JavaScript: Tips of the Day

Converts the given array elements into <li> tags and appends them to the list of the given id.

Example:

const tips_arrayToHtmlList = (arr, listID) =>(el => ((el = document.querySelector('#' + listID)),(el += arr.map(item => '<li>${item}</li>').join(''))))();
console.log(tips_arrayToHtmlList(['item 1', 'item 2'], 'myListID'));

Output:

"null
  • ${item}
  • ${item}
    • "