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:

JavaScript Code:

// Define a JavaScript function called is_weekend with parameter date1
var is_weekend =  function(date1){
    // Create a new Date object by parsing the provided date string
    var dt = new Date(date1);
     
    // Check if the day of the week is Saturday (6) or Sunday (0)
    if(dt.getDay() == 6 || dt.getDay() == 0)
       {
        // If the day is Saturday or Sunday, return "weekend"
        return "weekend";
        } 
}

// Output the result of checking if 'Nov 15, 2014' is a weekend
console.log(is_weekend('Nov 15, 2014'));
// Output the result of checking if 'Nov 16, 2014' is a weekend
console.log(is_weekend('Nov 16, 2014'));
// Output the result of checking if 'Nov 17, 2014' is undefined
console.log(is_weekend('Nov 17, 2014'));

Output:

weekend
weekend
undefined

Explanation:

In the exercise above,

• The code defines a JavaScript function named "is_weekend()" with one parameter 'date1', representing a date string.
• Inside the function:
• It creates a new Date object 'dt' by parsing the provided date string 'date1'.
• The "getDay()" method of the Date object is used to obtain the day of the week, where Sunday is represented by 0, Monday by 1, and so on.
• It checks if the day of the week obtained from "dt.getDay()" is either Saturday (6) or Sunday (0).
• If the condition is true (indicating that the day is either Saturday or Sunday), the function returns the string "weekend".
• The function does not have a return statement for cases where the provided date is not a weekend. In JavaScript, functions without an explicit return value implicitly return 'undefined'.
• The code then demonstrates the "is_weekend()" function by calling it with three different dates:
• 'Nov 15, 2014' (a Saturday)
• 'Nov 16, 2014' (a Sunday)
• 'Nov 17, 2014' (a Monday)
• Each console.log() call outputs the result of the "is_weekend()" function for the respective date to the console.

Flowchart:

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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