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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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JavaScript: Tips of the Day

defineProperty method

const person = { name: 'Owen' };

Object.defineProperty(person, 'age', { value: 21 });

console.log(person);
console.log(Object.keys(person));

With the defineProperty method, we can add new properties to an object, or modify existing ones. When we add a property to an object using the defineProperty method, they are by default not enumerable. The Object.keys method returns all enumerable property names from an object, in this case only "name".
Properties added using the defineProperty method are immutable by default. You can override this behavior using the writable, configurable and enumerable properties. This way, the defineProperty method gives you a lot more control over the properties you're adding to an object.

Ref: https://bit.ly/323Y0P6

 

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