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JavaScript: Find the leap years from a given range of years

JavaScript Array: Exercise-16 with Solution

Find the leap years in a given range of years.

Pictorial Presentation:

JavaScript: Find the leap years from a given range of years

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Find Leap years in a range</title>
</head>
<body>
</body>
</html>

JavaScript Code:

function leap_year_range(st_year, end_year) {
        var year_range = [];
        for (var i = st_year; i <= end_year; i++)
        {
             year_range.push(i);
        }
        var new_array = [];

  year_range.forEach(
   function(year)
    { 
       if (test_LeapYear(year)) 
       new_array.push(year);
    });

  return new_array;
     }

function test_LeapYear(year) {
   if ((year % 4 === 0 && year % 100 !== 0) || (year % 100 === 0 && year % 400 === 0)) {
                return year;
        } else {
                return false;
        }
}

console.log(leap_year_range(2000,2012));

Sample Output:

[2000,2004,2008,2012]

Flowchart:

Flowchart: JavaScript: Find the leap years from a given range of years

ES6 Version:

function leap_year_range(st_year, end_year) {
        const year_range = [];
        for (let i = st_year; i <= end_year; i++)
        {
             year_range.push(i);
        }
        const new_array = [];

  year_range.forEach(
   year => { 
      if (test_LeapYear(year)) 
      new_array.push(year);
   });

  return new_array;
     }

function test_LeapYear(year) {
   if ((year % 4 === 0 && year % 100 !== 0) || (year % 100 === 0 && year % 400 === 0)) {
                return year;
        } else {
                return false;
        }
}

console.log(leap_year_range(2000,2012));

Live Demo:

See the Pen JavaScript - Find the leap years from a given range of years - array-ex- 16 by w3resource (@w3resource) on CodePen.


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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