src/utils/Utils.ts

   1 import { WebSocketCloseEventStatusString } from '../types/WebSocket';
   2 import { v4 as uuid } from 'uuid';
   3
   4 export default class Utils {
   5   static generateUUID(): string {
   6     return uuid();
   7   }
   8
   9   static async sleep(milliSeconds: number): Promise<NodeJS.Timeout> {
  10     return new Promise((resolve) => setTimeout(resolve, milliSeconds));
  11   }
  12
  13   static secondsToHHMMSS(seconds: number): string {
  14     return Utils.milliSecondsToHHMMSS(seconds * 1000);
  15   }
  16
  17   static milliSecondsToHHMMSS(milliSeconds: number): string {
  18     return new Date(milliSeconds).toISOString().substr(11, 8);
  19   }
  20
  21   static removeExtraEmptyLines(tab: string[]): void {
  22     // Start from the end
  23     for (let i = tab.length - 1; i > 0; i--) {
  24       // Two consecutive empty lines?
  25       if (tab[i].length === 0 && tab[i - 1].length === 0) {
  26         // Remove the last one
  27         tab.splice(i, 1);
  28       }
  29       // Check last line
  30       if (i === 1 && tab[i - 1].length === 0) {
  31         // Remove the first one
  32         tab.splice(i - 1, 1);
  33       }
  34     }
  35   }
  36
  37   static convertToDate(value): Date {
  38     // Check
  39     if (!value) {
  40       return value;
  41     }
  42     // Check Type
  43     if (!(value instanceof Date)) {
  44       return new Date(value);
  45     }
  46     return value;
  47   }
  48
  49   static convertToInt(value): number {
  50     let changedValue = value;
  51     if (!value) {
  52       return 0;
  53     }
  54     if (Number.isSafeInteger(value)) {
  55       return value;
  56     }
  57     // Check
  58     if (typeof value === 'string') {
  59       // Create Object
  60       changedValue = parseInt(value);
  61     }
  62     return changedValue;
  63   }
  64
  65   static convertToFloat(value): number {
  66     let changedValue = value;
  67     if (!value) {
  68       return 0;
  69     }
  70     // Check
  71     if (typeof value === 'string') {
  72       // Create Object
  73       changedValue = parseFloat(value);
  74     }
  75     return changedValue;
  76   }
  77
  78   static convertToBoolean(value): boolean {
  79     let result = false;
  80     // Check boolean
  81     if (value) {
  82       // Check the type
  83       if (typeof value === 'boolean') {
  84         // Already a boolean
  85         result = value;
  86       } else {
  87         // Convert
  88         result = (value === 'true');
  89       }
  90     }
  91     return result;
  92   }
  93
  94   static getRandomFloat(max: number, min = 0): number {
  95     return Math.random() < 0.5 ? (1 - Math.random()) * (max - min) + min : Math.random() * (max - min) + min;
  96   }
  97
  98   static getRandomInt(max: number, min = 0): number {
  99     if (min) {
 100       return Math.floor(Math.random() * (max - min + 1) + min);
 101     }
 102     return Math.floor(Math.random() * max + 1);
 103   }
 104
 105   static roundTo(number: number, scale: number): number {
 106     const roundPower = Math.pow(10, scale);
 107     return Math.round(number * roundPower) / roundPower;
 108   }
 109
 110   static truncTo(number: number, scale: number): number {
 111     const truncPower = Math.pow(10, scale);
 112     return Math.trunc(number * truncPower) / truncPower;
 113   }
 114
 115   static getRandomFloatRounded(max: number, min = 0, scale = 2): number {
 116     if (min) {
 117       return Utils.roundTo(Utils.getRandomFloat(max, min), scale);
 118     }
 119     return Utils.roundTo(Utils.getRandomFloat(max), scale);
 120   }
 121
 122   static logPrefix(prefixString = ''): string {
 123     const date = new Date();
 124     return date.toLocaleString() + prefixString;
 125   }
 126
 127   static cloneObject<T>(object: T): T {
 128     return JSON.parse(JSON.stringify(object)) as T;
 129   }
 130
 131   static isIterable(obj): boolean {
 132     if (obj) {
 133       return typeof obj[Symbol.iterator] === 'function';
 134     }
 135     return false;
 136   }
 137
 138   static isEmptyJSon(document): boolean {
 139     // Empty?
 140     if (!document) {
 141       return true;
 142     }
 143     // Check type
 144     if (typeof document !== 'object') {
 145       return true;
 146     }
 147     // Check
 148     return Object.keys(document).length === 0;
 149   }
 150
 151   static isString(value): boolean {
 152     return typeof value === 'string';
 153   }
 154
 155   static isUndefined(value): boolean {
 156     return typeof value === 'undefined';
 157   }
 158
 159   static isNullOrUndefined(value): boolean {
 160     // eslint-disable-next-line no-eq-null, eqeqeq
 161     if (value == null) {
 162       return true;
 163     }
 164     return false;
 165   }
 166
 167   static isEmptyArray(object): boolean {
 168     if (!object) {
 169       return true;
 170     }
 171     if (Array.isArray(object) && object.length > 0) {
 172       return false;
 173     }
 174     return true;
 175   }
 176
 177   static isEmptyObject(obj): boolean {
 178     return !Object.keys(obj).length;
 179   }
 180
 181   static insertAt = (str: string, subStr: string, pos: number): string => `${str.slice(0, pos)}${subStr}${str.slice(pos)}`;
 182
 183   /**
 184    * @param  {number} [retryNumber=0]
 185    * @return {number} - delay in milliseconds
 186    */
 187   static exponentialDelay(retryNumber = 0): number {
 188     const delay = Math.pow(2, retryNumber) * 100;
 189     const randomSum = delay * 0.2 * Math.random(); // 0-20% of the delay
 190     return delay + randomSum;
 191   }
 192
 193   static getWebSocketCloseEventStatusString(code: number): string {
 194     if (code >= 0 && code <= 999) {
 195       return '(Unused)';
 196     } else if (code >= 1016) {
 197       if (code <= 1999) {
 198         return '(For WebSocket standard)';
 199       } else if (code <= 2999) {
 200         return '(For WebSocket extensions)';
 201       } else if (code <= 3999) {
 202         return '(For libraries and frameworks)';
 203       } else if (code <= 4999) {
 204         return '(For applications)';
 205       }
 206     }
 207     if (!Utils.isUndefined(WebSocketCloseEventStatusString[code])) {
 208       return WebSocketCloseEventStatusString[code] as string;
 209     }
 210     return '(Unknown)';
 211   }
 212 }