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# Object [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] > [Object][mdn-object] constructor.
## Installation ```bash npm install @stdlib/object-ctor ```
## Usage ```javascript var Object = require( '@stdlib/object-ctor' ); ``` #### Object( value ) Returns a new [object][mdn-object]. ```javascript var o = new Object( null ); // returns {} ``` * * * ### Properties #### Object.prototype.constructor Property whose value is a reference to the constructor function that created the instance object. ```javascript var o = new Object( null ); var ctr = o.constructor; // returns Object ``` * * * ### Methods #### Object.assign( target, ...sources ) Assigns enumerable properties of one or more source objects to a target object. ```javascript var o = Object.assign( {}, { 'a': 1, 'b': 2 } ); // returns { 'a': 1, 'b': 2 } ``` #### Object.create( prototype, properties ) Returns a new object with the given prototype and properties. ```javascript var o = Object.create( null, { 'a': { 'value': 1 }, 'b': { 'value': 2 } }); // returns { 'a': 1, 'b': 2 } function Person( first, last ) { this.first = first; this.last = last; } var p = Object.create( Person.prototype, { 'first': { 'value': 'Jane' }, 'last': { 'value': 'Doe' } }); // returns Person { 'first': 'Jane', 'last': 'Doe' } ``` #### Object.defineProperties( target, properties ) Defines new or modifies existing properties directly on an object, returning the object. ```javascript var o = Object.defineProperties( {}, { 'a': { 'value': 1 }, 'b': { 'value': 2 } }); // returns { 'a': 1, 'b': 2 } ``` #### Object.defineProperty( target, property, descriptor ) Defines a new property directly on an object, or modifies an existing property on an object, and returns the object. ```javascript var o = Object.defineProperty( {}, 'a', { 'value': 1, 'writable': true, 'enumerable': true, 'configurable': true }); // returns { 'a': 1 } ``` #### Object.entries( obj ) Returns an array of a given object's own enumerable string-keyed property entries, i.e. `[key, value]` pairs. ```javascript var o = { 'a': 1, 'b': 2 }; var arr = Object.entries( o ); // e.g., returns [ [ 'a', 1 ], [ 'b', 2 ] ] ``` #### Object.freeze( o ) Freezes an object. A frozen object can no longer be changed; freezing an object prevents new properties from being added to it, existing properties from being removed, and existing properties from being changed. ```javascript var o = { 'a': 1 }; Object.freeze( o ); // returns { 'a': 1 } o.b = 1; var v = o.b; // returns undefined ``` #### Object.getOwnPropertyDescriptor( o, p ) Returns an object that contains the properties of the given object. ```javascript var o = { 'a': 1 }; var d = Object.getOwnPropertyDescriptor( o, 'a' ); // returns { 'value': 1, 'writable': true, 'enumerable': true, 'configurable': true } ``` #### Object.getOwnPropertyDescriptors( o ) Returns an object whose properties are the result of calling `Object.getOwnPropertyDescriptor()` on every property of the given object. ```javascript var o = { 'a': 1, 'b': 2 }; var d = Object.getOwnPropertyDescriptors( o ); // returns { 'a': { 'value': 1, 'writable': true, 'enumerable': true, 'configurable': true }, 'b': { 'value': 2, 'writable': true, 'enumerable': true, 'configurable': true } } ``` #### Object.getOwnPropertyNames( o ) Returns an array of a given object's own property names. ```javascript var o = { 'a': 1, 'b': 2 }; var arr = Object.getOwnPropertyNames( o ); // e.g., returns [ 'a', 'b' ] ``` #### Object.getOwnPropertySymbols( o ) Returns an array of a given object's own property symbols. ```javascript var o = { 'a': 1 }; o[ Symbol( 'b' ) ] = 2; var arr = Object.getOwnPropertySymbols( o ); // returns [ Symbol(b) ] ``` #### Object.getPrototypeOf( o ) Returns the prototype of an object. ```javascript var o = { 'a': 1 }; var p = Object.getPrototypeOf( o ); // returns {} ``` #### Object.hasOwn( o, p ) Returns a boolean indicating whether an object has a property with the specified name. ```javascript var o = { 'a': 1 }; var b = Object.hasOwn( o, 'b' ); // returns false ``` #### Object.prototype.hasOwnProperty( p ) Returns a boolean indicating whether an object has a property with the specified name. ```javascript var o = { 'a': 1 }; var b = o.hasOwnProperty( 'a' ); // returns true ``` #### Object.is( value1, value2 ) Returns a boolean indicating whether two values are the same value. ```javascript var b = Object.is( 1, 1 ); // returns true b = Object.is( 1, '1' ); // returns false ``` #### Object.isExtensible( o ) Returns a boolean indicating whether an object is extensible (whether new properties can be added to it). ```javascript var o = { 'a': 1 }; var b = Object.isExtensible( o ); // returns true Object.preventExtensions( o ); b = Object.isExtensible( o ); // returns false ``` #### Object.isFrozen( o ) Returns a boolean indicating whether an object is frozen. Frozen objects can no longer be changed; freezing an object prevents new properties from being added to it, existing properties from being removed, and existing properties from being changed. ```javascript var o = { 'a': 1 }; var b = Object.isFrozen( o ); // returns false Object.freeze( o ); b = Object.isFrozen( o ); // returns true ``` #### Object.prototype.isPrototypeOf( o ) Returns a boolean indicating whether an object is in the prototype chain of another object. ```javascript var o = { 'a': 1 }; var p = { '__proto__': o }; var b = o.isPrototypeOf( p ); // returns true ``` #### Object.isSealed( o ) Returns a boolean indicating whether an object is sealed. An object is sealed if it is not extensible and all of its properties are non-configurable. ```javascript var o = { 'a': 1 }; var b = Object.isSealed( o ); // returns false Object.seal( o ); b = Object.isSealed( o ); // returns true ``` #### Object.keys( o ) Returns an array of a given object's own enumerable property names. ```javascript var o = { 'a': 1, 'b': 2 }; var arr = Object.keys( o ); // e.g., returns [ 'a', 'b' ] ``` #### Object.preventExtensions( o ) Prevents new properties from being added to an object. ```javascript var o = { 'a': 1 }; Object.preventExtensions( o ); o.b = 2; var b = ( o.b === void 0 ); // returns true o.a = 3; b = ( o.a === 3 ); // returns true ``` #### Object.prototype.propertyIsEnumerable( p ) Returns a boolean indicating whether a property is enumerable. ```javascript var o = { 'a': 1 }; var b = o.propertyIsEnumerable( 'a' ); // returns true var arr = [ 1, 2, 3 ]; b = arr.propertyIsEnumerable( 'length' ); // returns false ``` #### Object.seal( o ) Seals an object, preventing new properties from being added to it (i.e., making it non extensible) and marking all existing properties as non-configurable. ```javascript var o = { 'a': 1 }; Object.seal( o ); o.b = 2; var b = ( o.b === void 0 ); // returns true ``` #### Object.setPrototypeOf( o, proto ) Sets the prototype of an object. ```javascript var o = { 'a': 1 }; var p = { 'b': 2 }; Object.setPrototypeOf( o, p ); var b = ( o.b === 2 ); // returns true ``` #### Object.prototype.toLocaleString() Returns a string representing the object. ```javascript var o = { 'a': 1 }; var str = o.toLocaleString(); // returns ``` #### Object.prototype.toString() Returns a string representing the object. ```javascript var o = { 'a': 1 }; var str = o.toString(); // returns ``` #### Object.prototype.valueOf() Returns the primitive value of the object. ```javascript var o = {}; var v = o.valueOf(); // returns {} ``` #### Object.values( o ) Returns an array of a given object's own enumerable property values. ```javascript var o = { 'a': 1, 'b': 2 }; var arr = Object.values( o ); // e.g., returns [ 1, 2 ] ```
## Notes - If provided `null` or `undefined`, the function returns an empty object. - If provided an existing object, the function returns the input value unchanged. - Otherwise, if provided any other value (e.g., a number, string, etc), the function will return an object of the corresponding type.
## Examples ```javascript var Object = require( '@stdlib/object-ctor' ); var values = [ '5', 5, true, false, null, void 0, [], {} ]; var i; for ( i = 0; i < values.length; i++ ) { console.log( new Object( values[ i ] ) ); } ```
* * * ## Notice This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more. For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2024. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/object-ctor.svg [npm-url]: https://npmjs.org/package/@stdlib/object-ctor [test-image]: https://github.com/stdlib-js/object-ctor/actions/workflows/test.yml/badge.svg?branch=v0.2.1 [test-url]: https://github.com/stdlib-js/object-ctor/actions/workflows/test.yml?query=branch:v0.2.1 [coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/object-ctor/main.svg [coverage-url]: https://codecov.io/github/stdlib-js/object-ctor?branch=main [chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg [chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im [stdlib]: https://github.com/stdlib-js/stdlib [stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors [umd]: https://github.com/umdjs/umd [es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules [deno-url]: https://github.com/stdlib-js/object-ctor/tree/deno [deno-readme]: https://github.com/stdlib-js/object-ctor/blob/deno/README.md [umd-url]: https://github.com/stdlib-js/object-ctor/tree/umd [umd-readme]: https://github.com/stdlib-js/object-ctor/blob/umd/README.md [esm-url]: https://github.com/stdlib-js/object-ctor/tree/esm [esm-readme]: https://github.com/stdlib-js/object-ctor/blob/esm/README.md [branches-url]: https://github.com/stdlib-js/object-ctor/blob/main/branches.md [stdlib-license]: https://raw.githubusercontent.com/stdlib-js/object-ctor/main/LICENSE [mdn-object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object