JavaScript Code

Find the longest string in array in JavaScript

In this tutorial, you are given an array of strings. Write a JavaScript program to find the longest string in array.

Solution

To find the longest string in the given array of strings using JavaScript,

• Initialize the longest with the first string in array.
• Iterate over items of the array using a for loop
  • if the current element is largest in length than that of the longest, update longest with the current element.

We use

• String.length to get the length of a string.
• Less than comparison operator to check if the length of longest is less than the length of the current element in array.

Program

1. Given array of strings is strArray. Find the longest string.

function findLongestString(arr) {
  let longest = "";
      if (arr.length == 0) {
          return null;
      } else {
          longest = arr[0];
          for (let i = 1; i < arr.length; i++) {
              if ( longest.length < arr[i].length ) {
                  longest = arr[i];
              }
          }
          return longest;
      }
}

strArray = ["apple", "banana", "pineapple", "bean"];
longest = findLongestString(strArray);
console.log(longest);