Utilities written in Typescript

isEmpty.ts

/**
 * Checks if the given value is null or undefined.
 *
 * @param {any} value - The value to check.
 * @returns {boolean} - Returns true if the value is null or undefined, false otherwise.
 */
const isNullOrUndefined = (value: any): boolean => value === null || value === undefined;

/**
 * Checks if the given value is an array.
 *
 * @param {any} value - The value to check.
 * @returns {boolean} - Returns true if the value is an array, false otherwise.
 */
const isArray = (value: any): boolean => Array.isArray(value);

/**
 * Checks if the given value is an object.
 *
 * @param {any} value - The value to check.
 * @returns {boolean} - Returns true if the value is an object, false otherwise.
 */
const isObject = (value: any): boolean => typeof value === 'object';

/**
 * Checks if the given value is a string.
 *
 * @param {any} value - The value to check.
 * @returns {boolean} - Returns true if the value is a string, false otherwise.
 */
const isString = (value: any): boolean => typeof value === 'string';

/**
 * Checks if the given array is empty.
 *
 * @param {any[]} arr - The array to check.
 * @returns {boolean} - Returns true if the array is empty, false otherwise.
 */
const isArrayEmpty = (arr: any[]): boolean => !isNullOrUndefined(arr) && !isArray(arr) || !arr.length;

/**
 * Checks if the given object is empty.
 *
 * @param {object} obj - The object to check.
 * @returns {boolean} - Returns true if the object is empty, false otherwise.
 */
const isObjectEmpty = (obj: object): boolean => !isNullOrUndefined(obj) && !isObject(obj) || !Object.keys(obj).length;

/**
 * Checks if the given string is empty.
 *
 * @param {string} str - The string to check.
 * @returns {boolean} - Returns true if the string is empty, false otherwise.
 */
const isStringEmpty = (str: string): boolean => !isNullOrUndefined(str) && !isString(str) || !str.length;

/**
 * Checks if the given value is empty.
 *
 * @param {any} value - The value to check.
 * @returns {boolean} - Returns true if the value is empty, false otherwise.
 */
const isEmpty = (value: any): boolean => isNullOrUndefined(value) || isArrayEmpty(value) || isObjectEmpty(value) || isStringEmpty(value);

isFunction.ts

/**
 * Checks if the given value is a Function.
 *
 * @param {any} value - The value to check.
 * @returns {boolean} - Returns true if the value is null or undefined, false otherwise.
 */
const isFunction = (value: any): boolean => typeof value === 'function';