The Robot name exercise in JavaScript gets the error: An error occurred
We received the following error when we ran your code:
Identifier 'beforeEach' has already been declared
``` Here is my code: const LENGTH_OF_ALPHABET = 26;
const FIRST_ASCII = 'A'.charCodeAt(0);
/**
* The strategy here is to generate every possible name once, then randomly shuffle them. If we were to
* randomly generate a name each time, it becomes increasingly unlikely that we'll generate a unique
* name. By creating an array of all possibilities that have been shuffled, we ensure we get an unused
* name by popping from that list every time we need a new one.
*/
const generateAlphaCombos = (length, combo = '') => length
? [...Array(LENGTH_OF_ALPHABET).keys()]
.flatMap(i => generateAlphaCombos(length - 1, combo + String.fromCharCode(i + FIRST_ASCII)))
: combo;
const generateNumericalCombos = length => [...Array(10 ** length).keys()].map(num => `${num}`.padStart(length, '0'));
const generatePossibleNames = (alphaLength, numLength) => generateAlphaCombos(alphaLength)
.flatMap(alphaCombo => generateNumericalCombos(numLength).map(numCombo => alphaCombo + numCombo));
// Randomly shuffle list of all possible names using Fisher-Yates
const shuffleNames = ([...names]) => names.reduce((shuffled, _, first) => {
const second = Math.floor(Math.random() * first);
[shuffled[first], shuffled[second]] = [shuffled[second], shuffled[first]];
return shuffled;
}, names);
export class Robot {
static ALPHABETICALS_LENGTH = 2;
static NUMERICALS_LENGTH = 3;
static POSSIBLE_NAMES = generatePossibleNames(Robot.ALPHABETICALS_LENGTH, Robot.NUMERICALS_LENGTH);
static ELIGIBLE_NAMES = shuffleNames(Robot.POSSIBLE_NAMES);
static releaseNames() {
Robot.ELIGIBLE_NAMES = shuffleNames(Robot.POSSIBLE_NAMES);
}
#name
constructor() {
this.reset();
}
get name() {
return this.#name;
}
reset() {
this.#name = Robot.ELIGIBLE_NAMES.pop();
}
}