- /**
- * @param [retryNumber=0]
- * @returns delay in milliseconds
- */
- public static exponentialDelay(retryNumber = 0): number {
- const delay = Math.pow(2, retryNumber) * 100;
- const randomSum = delay * 0.2 * Utils.secureRandom(); // 0-20% of the delay
- return delay + randomSum;
+export const isIterable = <T>(obj: T): boolean => {
+ return !isNullOrUndefined(obj) ? typeof obj[Symbol.iterator as keyof T] === 'function' : false;
+};
+
+const isString = (value: unknown): boolean => {
+ return typeof value === 'string';
+};
+
+export const isEmptyString = (value: unknown): boolean => {
+ return isNullOrUndefined(value) || (isString(value) && (value as string).trim().length === 0);
+};
+
+export const isNotEmptyString = (value: unknown): boolean => {
+ return isString(value) && (value as string).trim().length > 0;
+};
+
+export const isUndefined = (value: unknown): boolean => {
+ return value === undefined;
+};
+
+export const isNullOrUndefined = (value: unknown): boolean => {
+ // eslint-disable-next-line eqeqeq, no-eq-null
+ return value == null;
+};
+
+export const isEmptyArray = (object: unknown): boolean => {
+ return Array.isArray(object) && object.length === 0;
+};
+
+export const isNotEmptyArray = (object: unknown): boolean => {
+ return Array.isArray(object) && object.length > 0;
+};
+
+export const isEmptyObject = (obj: object): boolean => {
+ if (obj?.constructor !== Object) {
+ return false;
+ }
+ // Iterates over the keys of an object, if
+ // any exist, return false.
+ for (const _ in obj) {
+ return false;