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JavaScript: Find 1st January be a Sunday between a range of years

JavaScript Basic: Exercise-7 with Solution

Write a JavaScript program to find which 1st January is being a Sunday between 2014 and 2050.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>A Program to find 1st January is being a Sunday between 2014 and 2050.</title>
</head>
<body>
</body>
</html>

JavaScript Code:

console.log('--------------------');
for (var year = 2014; year <= 2050; year++)
    {
    var d = new Date(year, 0, 1);
    if ( d.getDay() === 0 )
        console.log("1st January is being a Sunday  "+year);
    }
console.log('--------------------');

Sample Output:

--------------------
1st January is being a Sunday  2017
1st January is being a Sunday  2023
1st January is being a Sunday  2034
1st January is being a Sunday  2040
1st January is being a Sunday  2045
--------------------

Explanation:

Declaring a JavaScript date : In JavaScript Date objects are based on a time value that is the number of milliseconds since 1 January, 1970 UTC. You can declare a date in the following ways :

new Date();
new Date(value);
new Date(dateString);
new Date(year, month[, day[, hour[, minutes[, seconds[, milliseconds]]]]]);

The getDay() method is used to get the day of the week for the specified date according to local time, where 0 represents Sunday. The value returned by getDay() is an integer corresponding to the day of the week: 0 for Sunday, 1 for Monday, 2 for Tuesday, and so on.

Flowchart:

Flowchart: JavaScript : Find which 1st January be a Sunday between a range of years

ES6 Version:

console.log('--------------------');
for (let year = 2014; year <= 2050; year++)
    {
    const d = new Date(year, 0, 1);
    if ( d.getDay() === 0 )
        console.log(`1st January is being a Sunday  ${year}`);
    }
console.log('--------------------');

Live Demo:

See the Pen JavaScript: Sunday 2014 and 2050 - basic-ex-7 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to determine whether a given year is a leap year in the Gregorian calendar.
Next: Write a JavaScript program where the program takes a random integer between 1 to 10, the user is then prompted to input a guess number.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04