JavaScript: Find the longest string from a given array

Last update on May 30 2022 09:58:56 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-125 with Solution

Write a JavaScript program to find the longest string from a given array.

Pictorial Presentation:

JavaScript: Find the longest string from a given array.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title> Find the longest string from a given array</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function longest_str_in_array(arra)
  {
    var max_str = arra[0].length;
    var ans = arra[0];
    for (var i = 1; i < arra.length; i++) {
        var maxi = arra[i].length;
        if (maxi > max_str) {
            ans = arra[i];
            max_str = maxi;
        }
    }
    return ans;
}
console.log(longest_str_in_array(["ab", "a", "abcd"]));
console.log(longest_str_in_array(["ab", "ab", "ab"]));

Sample Output:

abcd
ab

Flowchart:

ES6 Version:

function longest_str_in_array(arra)
  {
    let max_str = arra[0].length;
    let ans = arra[0];
    for (let i = 1; i < arra.length; i++) {
        const maxi = arra[i].length;
        if (maxi > max_str) {
            ans = arra[i];
            max_str = maxi;
        }
    }
    return ans;
}
console.log(longest_str_in_array(["ab", "a", "abcd"]));
console.log(longest_str_in_array(["ab", "ab", "ab"]));

Live Demo:

See the Pen javascript-basic-exercise-125 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