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JavaScript: Check whether a date is a weekend date

JavaScript Datetime: Exercise-7 with Solution

Write a JavaScript function to test whether a date is a weekend.

Test Data :
console.log(is_weekend('Nov 15, 2014'));
console.log(is_weekend('Nov 16, 2014'));
console.log(is_weekend('Nov 17, 2014'));
Output :
"weekend"
"weekend"
undefined

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Weekend test</title>
</head>
<body>
</body>
</html>

JavaScript Code:

var is_weekend =  function(date1){
    var dt = new Date(date1);
     
    if(dt.getDay() == 6 || dt.getDay() == 0)
       {
        return "weekend";
        } 
}

console.log(is_weekend('Nov 15, 2014'));
console.log(is_weekend('Nov 16, 2014'));
console.log(is_weekend('Nov 17, 2014'));

Sample Output:

weekend
weekend
undefined

Flowchart:

Flowchart: JavaScript- Check whether a date is a weekend date

Live Demo:

See the Pen JavaScript - Check whether a date is a weekend date-date-ex- 7 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Promise.all method

const promise1 = Promise.resolve('First')
const promise2 = Promise.resolve('Second')
const promise3 = Promise.reject('Third')
const promise4 = Promise.resolve('Fourth')

const runPromises = async () => {
	const res1 = await Promise.all([promise1, promise2])
	const res2  = await Promise.all([promise3, promise4])
	return [res1, res2]
}

runPromises()
	.then(res => console.log(res))
	.catch(err => console.log(err))

The Promise.all method runs the passed promises in parallel. If one promise fails, the Promise.all method rejects with the value of the rejected promise. In this case, promise3 rejected with the value "Third". We're catching the rejected value in the chained catch method on the runPromises invocation to catch any errors within the runPromises function. Only "Third" gets logged, since promise3 rejected with this value.