import { inject, injectable } from 'inversify';
import { ServiceIdentifiers } from '../container/ServiceIdentifiers';
import { IArrayUtils } from '../interfaces/utils/IArrayUtils';
import { IRandomGenerator } from '../interfaces/utils/IRandomGenerator';
@injectable()
export class ArrayUtils implements IArrayUtils {
/**
* @type {IRandomGenerator}
*/
private readonly randomGenerator: IRandomGenerator;
/**
* @param {IRandomGenerator} randomGenerator
*/
constructor (
@inject(ServiceIdentifiers.IRandomGenerator) randomGenerator: IRandomGenerator
) {
this.randomGenerator = randomGenerator;
}
/**
* @param {number} length
* @returns {number[]}
*/
public createWithRange (length: number): number[] {
const range: number[] = [];
for (let i: number = 0; i < length; i++) {
range.push(i);
}
return range;
}
/**
* @param {T[]} array
* @param {number} times
* @returns {T[]}
*/
public rotate (array: T[], times: number): T[] {
if (!array.length) {
throw new ReferenceError(`Cannot rotate empty array.`);
}
if (times <= 0) {
return array;
}
const newArray: T[] = array;
let temp: T | undefined;
while (times--) {
temp = newArray.pop();
if (temp) {
newArray.unshift(temp);
}
}
return newArray;
}
/**
* @param {T[]} array
* @returns {T[]}
*/
public shuffle (array: T[]): T[] {
const shuffledArray: T[] = [...array];
for (let i: number = shuffledArray.length; i; i--) {
const j: number = Math.floor(this.randomGenerator.getMathRandom() * i);
[shuffledArray[i - 1], shuffledArray[j]] = [shuffledArray[j], shuffledArray[i - 1]];
}
return shuffledArray;
}
}