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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

Classes/function constructors

class Person {
  constructor() {
    this.name = 'Owen';
  }
}

Person = class AnotherPerson {
  constructor() {
    this.name = 'Eddie';
  }
};

const member = new Person();
console.log(member.name);

We can set classes equal to other classes/function constructors. In this case, we set Person equal to AnotherPerson. The name on this constructor is Eddie, so the name property on the new Person instance member is "Eddie".

Ref: https://bit.ly/3jFRBje