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| import getTag from './.internal/getTag.js' | |
| import isArguments from './isArguments.js' | |
| import isArrayLike from './isArrayLike.js' | |
| import isBuffer from './isBuffer.js' | |
| import isPrototype from './.internal/isPrototype.js' | |
| import isTypedArray from './isTypedArray.js' | |
| /** Used to check objects for own properties. */ | |
| const hasOwnProperty = Object.prototype.hasOwnProperty | |
| /** | |
| * Checks if `value` is an empty object, collection, map, or set. | |
| * | |
| * Objects are considered empty if they have no own enumerable string keyed | |
| * properties. | |
| * | |
| * Array-like values such as `arguments` objects, arrays, buffers, strings, or | |
| * jQuery-like collections are considered empty if they have a `length` of `0`. | |
| * Similarly, maps and sets are considered empty if they have a `size` of `0`. | |
| * | |
| * @since 0.1.0 | |
| * @category Lang | |
| * @param {*} value The value to check. | |
| * @returns {boolean} Returns `true` if `value` is empty, else `false`. | |
| * @example | |
| * | |
| * isEmpty(null) | |
| * // => true | |
| * | |
| * isEmpty(true) | |
| * // => true | |
| * | |
| * isEmpty(1) | |
| * // => true | |
| * | |
| * isEmpty([1, 2, 3]) | |
| * // => false | |
| * | |
| * isEmpty('abc') | |
| * // => false | |
| * | |
| * isEmpty({ 'a': 1 }) | |
| * // => false | |
| */ | |
| function isEmpty(value) { | |
| if (value == null) { | |
| return true | |
| } | |
| if (isArrayLike(value) && | |
| (Array.isArray(value) || typeof value === 'string' || typeof value.splice === 'function' || | |
| isBuffer(value) || isTypedArray(value) || isArguments(value))) { | |
| return !value.length | |
| } | |
| const tag = getTag(value) | |
| if (tag == '[object Map]' || tag == '[object Set]') { | |
| return !value.size | |
| } | |
| if (isPrototype(value)) { | |
| return !Object.keys(value).length | |
| } | |
| for (const key in value) { | |
| if (hasOwnProperty.call(value, key)) { | |
| return false | |
| } | |
| } | |
| return true | |
| } | |
| export default isEmpty |