JavaScript: Find the longest word within a string

Last update on May 30 2022 10:08:55 (UTC/GMT +8 hours)

JavaScript Function: Exercise-6 with Solution

Write a JavaScript function that accepts a string as a parameter and find the longest word within the string.
Sample Data and output:
Example string: 'Web Development Tutorial'
Expected Output: 'Development'

Pictorial Presentation:

JavaScript: Find the longest word within a string

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Find the longest word within a string</title>
</head>
<body>
  
</body>
</html>

JavaScript Code:

function find_longest_word(str)
{
  var array1 = str.match(/\w[a-z]{0,}/gi);
  var result = array1[0];

  for(var x = 1 ; x < array1.length ; x++)
  {
    if(result.length < array1[x].length)
    {
    result = array1[x];
    } 
  }
  return result;
}
console.log(find_longest_word('Web Development Tutorial'));

Sample Output:

Development

Explanation:
Assume str = '@Web Development #Tutorial';

The match() method is used to retrieve the matches when matching a string against a regular expression.
Therefore str.match(/\w[a-z]{0,}/gi) will return ["Web", "Development", "Tutorial"].

For loop checks the length of the array element and compare with previous one and finally return the longest string.

The length property represents an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.
Syntax -> arr.length

Flowchart:

Live Demo:

See the Pen JavaScript -Converts the first letter of each word of a string in upper case-function-ex- 5 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