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:
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.
What is the difficulty level of this exercise?
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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
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