@kitmi/utils/src/isEmpty.js

A JavaScript utility library for both server and browser

import isTypedArray from './isTypedArray';

/**
 * Check whether a value is empty, or an object is empty.
 * Note: lodash's isEmpty does not check symbol properties.
 *  const key = Symbol('key');
 *  const obj = {
 *      [key]: 'something'
 *  };
 *  _.isEmpty(obj).should.be.true;
 *  isEmpty(obj).should.be.false;
 *
 * @param {*} value
 * @returns {boolean}
 */
function isEmpty(value) {
    if (value == null) {
        return true;
    }

    const type = typeof value;

    if (type === 'string') return value.length === 0;

    if (type === 'object') {
        if (
            Array.isArray(value) ||
            Buffer.isBuffer(value) ||
            isTypedArray(value) ||
            value.toString() === '[object Arguments]'
        ) {
            return value.length === 0;
        }

        if (value instanceof Map || value instanceof Set) {
            return value.size === 0;
        }

        return Object.keys(value).length === 0 && Object.getOwnPropertySymbols(value).length === 0;
    }

    return false;
}

export default isEmpty;