@leetcoderoulette/roulette/lib/cjs/index.js

https://leetcoderoulette.com roulette library

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
;
const DEFAULT_OPTIONS = {
    popWhenGettingObject: true,
    enableSetReset: true
};
/**
   * Roulette class to get a random values from a set of values.
   */
class Roulette {
    /**
     * Creates new Roulette instance with initial set.
     * @param values Initial values array.
     * @param options Roulette options.
     */
    constructor(values, options) {
        this.options = DEFAULT_OPTIONS;
        if (values.length === 0) {
            throw Roulette.NO_VALUES_ERROR;
        }
        this.set = new Set(values);
        this.options = Object.assign(Object.assign({}, this.options), options);
    }
    /**
     * Gets a random value from set and deletes it.
     * @returns A random value from the set.
     */
    pop() {
        if (this.set.size === 0) {
            throw Roulette.NO_VALUES_ERROR;
        }
        const index = Math.floor(Math.random() * this.set.size);
        const values = Array.from(this.set);
        const value = values[index];
        if (this.options.popWhenGettingObject) {
            this.set.delete(value);
        }
        return value;
    }
    /**
     * Gets the number of values left in the set.
     * @returns Size of the set.
     */
    get size() {
        return this.set.size;
    }
    /**
     * Gets array of available problems from problemset.
     * @returns Array of problems in the problemset.
     */
    get values() {
        return Array.from(this.set);
    }
    /**
     * Sets the set to the provided objects.
     */
    set values(values) {
        if (!this.options.enableSetReset) {
            throw new Error("Unable to reset set when enableSetReset is false. Try changing this value to true.");
        }
        if (values.length === 0) {
            throw Roulette.NO_VALUES_ERROR;
        }
        this.set = new Set(values);
    }
}
exports.default = Roulette;
Roulette.NO_VALUES_ERROR = new Error("set is empty.");