Find Longest Word in a String

In this example, you will create a JavaScript function that will accept a string that contains multiple words and find the longest among those words and display the length of the string.

The program takes following steps to find the longest string.

  • Accept the string in a function – findLengthLongest().
  • Use JavaScript regex to extract each word from the string.
  • Store the words in an array.
  • Find length of each word in the array and copy in a variable called max.
  • At the end, max has the length of longest word.
  • Display the result.

JavaScript Code: Find Longest Word in a String

function findLengthLongest() {

    var str = document.getElementById("in").value;
    var max = 0;
    var regex = /\w+/gi;
    var word = [];
    word = str.match(regex);
  for (let i = 0;i < word.length;i++){
  
      if(word[i].length > max)
      {

        max = word[i].length;
      
      }
  }
   var result = max.toString(10);

   document.getElementById("out").innerHTML = result;
}

function MyClear(){

   document.getElementById("in").value = "";

}

Note that we are accepting values from textbox control and displaying result in a H1 element. To find the length, we use the .length function and loop through each word of the array. Each time a greater length word if found, update the variable max.

Program Code: Find Longest Word

<!DOCTYPE html>
<html>
<head>
   <title>Find Longest Word</title>
   <meta charset="utf-8">
   <style>
   main{
    width:40%;
	padding:2%;
	margin:10% auto;
	background:DodgerBlue;
	text-align:center;
   }
     #in{
	 
	  padding:10px;
	  width:150px;
	  background:whitesmoke;  
	  margin:auto;
	 }
	 
	 button{
	 padding:10px;
	 margin:10px;
	 
	 }
   </style>
</head>
<body>
<main>
<h1 id="out">Output here</h1>
<input type="text" id="in" /><br/>
<button onclick="findLengthLongest()">Find Longest Word</button>
<button onclick="MyClear()">Clear</button>
</main>
<script>
function findLengthLongest() {

    var str = document.getElementById("in").value;
    var max = 0;
    var regex = /\w+/gi;
    var word = [];
    word = str.match(regex);
  for (let i = 0;i < word.length;i++){
  
      if(word[i].length > max)
      {

        max = word[i].length;
      
      }
  }
   var result = max.toString(10);

   document.getElementById("out").innerHTML = result;
}

function MyClear(){

   document.getElementById("in").value = "";

}
</script>

</body>
</html>

Output To Browser: Find Longest Word

Output - Find Longest Word In a String
Output – Find Longest Word In a String

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