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Contents
export default class PerfectNumbers {
/**
* Calculate all the divisors for a given number.
* @param {number} number - natural number.
* @returns {array} array that contains the divisors for a given number NOT including the number itself.
*/
getDivisors(number) {
let i;
let divs = new Array();
// Accepts only natural numbers greater than 1.
if (number <= 1) {
return divs;
}
// 1 always divides everyone!
divs.push(1);
// Calculate the divisors up the the half of the number + 1
for (i = 2; i <= number / 2; i++) {
if (number % i === 0) {
divs.push(i);
}
}
return divs;
}
/**
* Classify a given number as perfect, abundant or deficient.
* @param {number} number - number to be classified. Note: if the number is equal or smaller than 0,
* then returns an error: Classification is only possible for natural numbers.
* @returns {string} - string that contains the number classification (perfect, abundant or deficient).
*/
classify(number) {
let i, sum, result;
// Check if the input is valid
if (number <= 0) {
throw new Error('Classification is only possible for natural numbers.');
}
// Factorize the current number.
const divsArray = this.getDivisors(number);
// Sum the factors.
sum = divsArray.reduce((sum, div) => sum += div, 0);
// Check if the number is perfect.
if (sum === number) {
result = 'perfect';
}
else if (sum > number) {
result = 'abundant';
}
else {
result = 'deficient';
}
return result;
}
}
Version data entries
21 entries across 21 versions & 1 rubygems