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JavaScript: Find the maximum integer n

JavaScript Basic: Exercise-145 with Solution

Write a JavaScript program to find the maximum integer n such that 1 + 2 + ... + n <= a given integer.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Find the maximum integer n.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function sumn(val) {
  var sn = 0;
  var i = 0;
  while (sn <= val) {
    sn += i++;
  }
  return i - 2;
}
console.log(sumn(11))
console.log(sumn(15))

Sample Output:

4
5

Flowchart:

Flowchart: JavaScript - Find the maximum integer n

ES6 Version:

function sumn(val) {
  let sn = 0;
  let i = 0;
  while (sn <= val) {
    sn += i++;
  }
  return i - 2;
}
console.log(sumn(11))
console.log(sumn(15))

Live Demo:

See the Pen javascript-basic-exercise-145 by w3resource (@w3resource) on CodePen.

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Next: Write a JavaScript program to compute the sum of cubes of all integer from 1 to a given integer.

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JavaScript: Tips of the Day

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters)

Example:

const isAnagram = (str1, str2) => {
  const normalize = str =>
    str
      .toLowerCase()
      .replace(/[^a-z0-9]/gi, '')
      .split('')
      .sort()
      .join('');
  return normalize(str1) === normalize(str2);
};
console.log(isAnagram('iceman', 'cinema')); // true

Output:

true