JavaScript: Find the second lowest and second greatest numbers from an array

Last update on May 30 2022 10:05:58 (UTC/GMT +8 hours)

JavaScript Function: Exercise-11 with Solution

Write a JavaScript function which will take an array of numbers stored and find the second lowest and second greatest numbers, respectively.

Pictorial Presentation:

JavaScript: Second lowest and second greatest numbers from an array

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Find the second lowest and second greatest numbers from an array</title>
</head>
<body>
  
</body>

JavaScript Code:

function Second_Greatest_Lowest(arr_num)
{
  arr_num.sort(function(x,y)
           {
           return x-y;
           });
  var uniqa = [arr_num[0]];
  var result = [];
  
  for(var j=1; j < arr_num.length; j++)
  {
    if(arr_num[j-1] !== arr_num[j])
    {
      uniqa.push(arr_num[j]);
    }
  }
    result.push(uniqa[1],uniqa[uniqa.length-2]);
  return result.join(',');
  }

console.log(Second_Greatest_Lowest([1,2,3,4,5]));

Sample Output:

2,4

Flowchart:

Live Demo:

See the Pen JavaScript -Second lowest and second greatest numbers from an array-function-ex- 11 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