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JavaScript: Find the longest string from a given array of strings

JavaScript Basic: Exercise-83 with Solution

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

Pictorial Presentation:

JavaScript: Find the longest string from a given array of strings.

Sample Solution:

HTML Code:

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

</body>
</html>

JavaScript Code:

function longest_string(str_ara) {
  var max = str_ara[0].length;
  str_ara.map(v => max = Math.max(max, v.length));
  result = str_ara.filter(v => v.length == max);
  return result;
}

console.log(longest_string(['a', 'aa', 'aaa',
                                          'aaaaa','aaaa']))

Sample Output:

["aaaaa"]

Flowchart:

Flowchart: JavaScript - Find the longest string from a given array of strings

ES6 Version:

function longest_string(str_ara) {
  let max = str_ara[0].length;
  str_ara.map(v => max = Math.max(max, v.length));
  result = str_ara.filter(v => v.length == max);
  return result;
}

console.log(longest_string(['a', 'aa', 'aaa',
                                          'aaaaa','aaaa']))

Live Demo:

See the Pen javascript-basic-exercise-83 by w3resource (@w3resource) on CodePen.



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Previous: Write a JavaScript to add two positive integers without carry.
Next: Write a JavaScript to replace each character of a given string by the next one in the English alphabet.

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JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925 

Output:

385
3025
2925