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FunctionProject/api/assets/functions/main/heapAlgorithm.js

52 lines
2.1 KiB
JavaScript

const errorHandling = require('../../utils/errorHandling');
const { requiredFields } = require('../../config/errors');
const formatNumberResult = require('../secondary/formatNumberResult');
/**
* @description Retourne un tableau contenant toutes les possibilités d'anagramme d'un mot.
* @param {String} string - La chaîne de caractère à permuter
* @returns {Array}
* @examples heapAlgorithm('abc') → ["abc", "acb", "bac", "bca", "cab", "cba"]
*/
function heapAlgorithm(string) {
let results = [];
if (string.length === 1) {
results.push(string);
return results;
}
for (let indexString = 0; indexString < string.length; indexString++) {
const firstChar = string[indexString];
const charsLeft = string.substring(0, indexString) + string.substring(indexString + 1);
const innerPermutations = heapAlgorithm(charsLeft);
for (let indexPermutation = 0; indexPermutation < innerPermutations.length; indexPermutation++) {
results.push(firstChar + innerPermutations[indexPermutation]);
}
}
return results;
}
/* OUTPUTS */
module.exports = heapAlgorithmOutput = ({ res, next }, argsObject) => {
let { string } = argsObject;
// S'il n'y a pas les champs obligatoire
if (!(string)) {
return errorHandling(next, requiredFields);
}
// Si la chaîne de caractère dépasse LIMIT_CHARACTERS caractères
const LIMIT_CHARACTERS = 7;
if (string.length > LIMIT_CHARACTERS) {
return errorHandling(next, { message: `Par souci de performance, vous ne pouvez pas exécuter cette fonction avec un mot dépassant ${LIMIT_CHARACTERS} caractères.`, statusCode: 400 });
}
const result = heapAlgorithm(string);
let resultHTML = `<p>Il y a ${formatNumberResult(result.length)} possibilités d'anagramme pour le mot "${string}" qui contient ${string.length} caractères, la liste : <br/><br/>`;
result.forEach((string) => {
resultHTML += string + "<br/>";
});
resultHTML += "</p>";
return res.status(200).json({ result, resultHTML });
}