{"id":224766,"date":"2020-01-22T15:37:18","date_gmt":"2020-01-22T15:37:18","guid":{"rendered":"https:\/\/webkul.com\/blog\/?p=224766"},"modified":"2020-01-23T12:57:19","modified_gmt":"2020-01-23T12:57:19","slug":"javascript-object-methods","status":"publish","type":"post","link":"https:\/\/webkul.com\/blog\/javascript-object-methods\/","title":{"rendered":"Javascript Object methods"},"content":{"rendered":"\n

Hey, do you know javascript has some Object methods and you can manipulate your object by using that. We will look into such methods in this blog.<\/p>\n\n\n\n

Before starting, let’s observe master obj (Object) closely<\/p>\n\n\n\n

<script>\nconsole.dir(Object);\n<\/script><\/pre>\n\n\n\n
Please see below result<\/p>\n\n\n\n
\"master_object_result\"<\/figure>\n\n\n\n
As you can see above, some methods are listed like assign, create, freeze, etc so we will look into some of the methods in this blog.<\/p>\n\n\n\n
Object.create()<\/strong><\/p>\n\n\n\n
This method is used to create new object by using an existing object<\/p>\n\n\n\n
Syntax:<\/strong> Object.create(propertiesObject);<\/p>\n\n\n\n
<script>\nlet obj = {\n  profile: {\n    name: 'john doe',\n    age: '28'\n  }\n};\nlet new_obj = Object.create(obj);\nconsole.log(new_obj.profile.name);  \/\/john doe\n<\/script><\/pre>\n\n\n\n
let’s see another example of create()<\/p>\n\n\n\n
<script>\nlet fun = function() {\n  this.firstName = 'john';\n  this.lastName = 'doe';\n};\nfun.prototype.fullName = function() {\n  return `firstname is ${this.firstName} and lastname is ${this.lastName}`;\n}\nlet obj = new fun();\nconsole.log(obj.fullName());  \/\/here result will be 'firstname is john and lastname is doe'\n\nlet fun_new = function() {\n  fun.call(this);\n};\n\nfun_new.prototype = Object.create(fun.prototype);\n\nlet obj_new = new fun_new();\nconsole.dir(obj_new.fullName());  \/\/here also result will be 'firstname is john and lastname is doe'\n<\/script><\/pre>\n\n\n\n
you can check call() method here<\/a><\/p>\n\n\n\n
Object.assign()<\/strong><\/p>\n\n\n\n
it is used to copy one or more source objects into target object.<\/p>\n\n\n\n
Syntax:<\/strong> Object.assign(targetObject, ..sourceObjects);<\/p>\n\n\n\n
<script>\nlet source = {\n  profile: {\n    name: 'john doe',\n    age: '28'\n  }\n};\nlet target = {\n  address: {\n    city: 'noida',\n    country: 'india'\n  }\n};\nlet assign_obj = Object.assign(target, source);\nconsole.log(`${assign_obj.profile.name} from ${assign_obj.address.city} ${assign_obj.address.country}`);  \/\/john doe from noida india\nconsole.log(`${target.profile.name} from ${target.address.city} ${target.address.country}`);  \/\/john doe from noida india\n<\/script><\/pre>\n\n\n\n
what happens if target and source objects have the same properties<\/p>\n\n\n\n
<script>\nlet target = {\n  x: '20',\n  y: '50'\n};\nlet source1 = {\n  x: '30',\n  z: '60'\n};\nlet source2 = {\n  x: '40',\n};\nObject.assign(target, source1, source2);\nconsole.log(target);  \/\/{x: "40", y: "50", z: "60"}\n<\/script><\/pre>\n\n\n\n
Object.defineProperty()<\/strong><\/p>\n\n\n\n
You can define an object property by Object.defineProperty()<\/p>\n\n\n\n
Syntax:<\/strong> Object.defineProperty(obj, property, descriptor);<\/p>\n\n\n\n
Let’s see an example<\/p>\n\n\n\n
<script>\nlet obj = {};\n\nObject.defineProperty(obj, 'firstName', {value: 'john', writable: true});\nObject.defineProperty(obj, 'lastName', {value: 'doe', writable: true, enumerable: true, configurable: false});\nObject.defineProperty(obj, 'fullName', {\n  get: function(){\n    return `firstname is ${this.firstName} and lastname is ${this.lastName}`;\n  },\n  set: function(name){\n    [this.firstName, this.lastName] = name.split(" ");\n  }\n});\nconsole.log(obj.fullName);  \/\/ here result will be "firstname is john and lastname is doe"\n\nobj.fullName = 'webkul software';\n\nconsole.log(obj.fullName);  \/\/ here result will be "firstname is webkul and lastname is software"\n<\/script><\/pre>\n\n\n\n
value:<\/strong> what will be the value of your property<\/p>\n\n\n\n
writable:<\/strong> default it is false which can not be changed, if set true then you can change property<\/p>\n\n\n\n
enumerable: <\/strong>if true then it will display during enumeration<\/p>\n\n\n\n
configurable:<\/strong> default it is false, if true then you can not delete this property<\/p>\n\n\n\n
Set\/Get: <\/strong>if using getter and setter then you can not use other keys like writable, enumerable, etc<\/p>\n\n\n\n
You can check getter\/setter here<\/a><\/p>\n\n\n\n
Object.defineProperties()<\/strong><\/p>\n\n\n\n
if you want to add multiple properties then you can use it<\/p>\n\n\n\n
Syntax:<\/strong> Object.defineProperties(obj, properties);<\/p>\n\n\n\n
<script>\nlet obj = {};\n\nObject.defineProperties(obj, {\n  firstName: {\n    value: 'john',\n    writable: true\n  },\n  lastName: {\n    value: 'doe', writable: true, enumerable: true, configurable: false\n  },\n  fullName: {\n    get: function(){\n      return `firstname is ${this.firstName} and lastname is ${this.lastName}`;\n    },\n    set: function(name){\n      [this.firstName, this.lastName] = name.split(" ");\n    }\n  }\n});\nconsole.log(obj.fullName);  \/\/ here result will be "firstname is john and lastname is doe"\n\nobj.fullName = 'webkul software';\n\nconsole.log(obj.fullName);  \/\/ here result will be "firstname is webkul and lastname is software"\n<\/script><\/pre>\n\n\n\n
as you can see in the upper example, I have added three properties similar to Object.defineProperty() example<\/p>\n\n\n\n
Object.keys()<\/strong><\/p>\n\n\n\n
It is used for enumerable keys of an object. You will understand the ‘enumerable’ key here which was used under Object.defineProperty ();<\/p>\n\n\n\n
Syntax:<\/strong> Object.keys(obj)<\/p>\n\n\n\n
<script>\nlet obj = {};\n\nObject.defineProperties(obj, {\n  firstName: {\n    value: 'john',\n    writable: true,\n    enumerable: true,\n  },\n  lastName: {\n    value: 'doe', writable: true, enumerable: true, configurable: false\n  },\n  fullName: {\n    get: function(){\n      return `firstname is ${this.firstName} and lastname is ${this.lastName}`;\n    },\n    set: function(name){\n      [this.firstName, this.lastName] = name.split(" ");\n    }\n  }\n});\n\nObject.keys(obj).map(function(current, index){\n  console.log(`property ${current} and position ${index}`);\n})\n<\/script><\/pre>\n\n\n\n
let’s see now by removing enumerable key for firstName property and see the following code<\/p>\n\n\n\n
<script>\nlet obj = {};\n\nObject.defineProperties(obj, {\n  firstName: {\n    value: 'john',\n    writable: true,\n  },\n  lastName: {\n    value: 'doe', writable: true, enumerable: true, configurable: false\n  },\n  fullName: {\n    get: function(){\n      return `firstname is ${this.firstName} and lastname is ${this.lastName}`;\n    },\n    set: function(name){\n      [this.firstName, this.lastName] = name.split(" ");\n    }\n  }\n});\n\nObject.keys(obj).map(function(current, index){\n  console.log(`property ${current} and position ${index}`);\n})\n<\/script><\/pre>\n\n\n\n
In the upper example, firstName property will not get resulted because enumerable is false for firstName property<\/p>\n\n\n\n
Object.values()<\/strong><\/p>\n\n\n\n
It is used for getting all enumerable property values of my object not keys<\/p>\n\n\n\n
Syntax:<\/strong> Object.values(obj)<\/p>\n\n\n\n
<script>\nlet obj = {};\n\nObject.defineProperties(obj, {\n  firstName: {\n    value: 'john',\n    writable: true,\n    enumerable: true\n  },\n  lastName: {\n    value: 'doe', writable: true, enumerable: true, configurable: false\n  },\n  fullName: {\n    get: function(){\n      return `firstname is ${this.firstName} and lastname is ${this.lastName}`;\n    },\n    set: function(name){\n      [this.firstName, this.lastName] = name.split(" ");\n    }\n  }\n});\n\nObject.values(obj).map(function(current, index){\n  console.log(`property ${current} and position ${index}`);\n})\n<\/script><\/pre>\n\n\n\n
Object.freeze()<\/strong><\/p>\n\n\n\n
Freeze method allows us to prevent add\/edit\/delete new or existing property. If trying to add\/edit\/delete in strict mode then it will generate errors.<\/p>\n\n\n\n
syntax:<\/strong> Object.freeze(obj)<\/p>\n\n\n\n
<script>\nlet obj = {\n  firstName: 'john'\n};\nObject.freeze(obj);\nobj.firstName = 'webkul';\nconsole.log(obj.firstName);\n<\/script><\/pre>\n\n\n\n
if you will run upper code, then you will get result ‘john’ not ‘webkul’ due to frozen<\/p>\n\n\n\n
Object.isFrozen()<\/strong><\/p>\n\n\n\n
For checking any object is frozen or not<\/p>\n\n\n\n
Syntax: <\/strong>Object.isFrozen(obj)<\/p>\n\n\n\n
<script>\nlet obj = {\n  firstName: 'john'\n};\nObject.freeze(obj);\nconsole.log(Object.isFrozen(obj));\n<\/script><\/pre>\n\n\n\n
Object.seal()<\/strong><\/p>\n\n\n\n
seal method allows us to prevent add\/edit\/delete the new or existing property but any existing property can be changed if it is writable. If trying to add\/edit\/delete any new or existing property in strict mode then it will generate errors except edit in writable case.<\/p>\n\n\n\n
syntax:<\/strong> Object.seal(obj)<\/p>\n\n\n\n
<script>\n'use strict';\nlet obj = {};\nObject.defineProperty(obj, 'firstName', {\n  value: 'john',\n  writable: true\n});\nObject.seal(obj);\nconsole.log(obj.firstName);  \/\/ here result is 'john'\nobj.firstName = 'webkul';\nconsole.log(obj.firstName);  \/\/ here result is 'webkul'\n<\/script><\/pre>\n\n\n\n
Object.isSealed()<\/strong><\/p>\n\n\n\n
For checking any object is sealed or not<\/p>\n\n\n\n
syntax: <\/strong>Object.isSealed(obj)<\/p>\n\n\n\n
<script>\n'use strict';\nlet obj = {};\nObject.defineProperty(obj, 'firstName', {\n  value: 'john',\n  writable: true\n});\nObject.seal(obj);\nconsole.log(Object.isSealed(obj));\n<\/script><\/pre>\n\n\n\n
Object.preventExtensions()<\/strong><\/p>\n\n\n\n
this method has following features<\/p>\n\n\n\n
prevents to add new or existing property<\/p>\n\n\n\n
edit existing property only if  writable<\/p>\n\n\n\n
delete existing property if configurable<\/p>\n\n\n\n
syntax:<\/strong> Object.preventExtensions(obj)<\/p>\n\n\n\n
<script>\n'use strict';\nlet obj = {\n  firstName: 'john'\n};\nObject.defineProperty(obj, 'lastName', {\n  value: 'doe',\n  writable: true\n});\nObject.preventExtensions(obj);\nobj.lastName = 'software';  \/\/ can change due to writable\ndelete obj.firstName;  \/\/can delete due to default behavious configurable \nconsole.log(obj);\n<\/script><\/pre>\n\n\n\n
In the upper example, if you will try to delete ‘lastName’ then you will get an error<\/p>\n\n\n\n
Object.isExtensible()<\/strong><\/p>\n\n\n\n
For checking any object is extensible or not<\/p>\n\n\n\n
syntax: <\/strong>Object.isExtensible(obj)<\/p>\n\n\n\n
<script>\n'use strict';\nlet obj = {\n  firstName: 'john'\n};\nObject.defineProperty(obj, 'lastName', {\n  value: 'doe',\n  writable: true\n});\nObject.preventExtensions(obj);\nconsole.log(Object.isExtensible(obj));  \/\/false\n<\/script><\/pre>\n\n\n\n
Object.hasOwnProperty()<\/strong><\/p>\n\n\n\n
For checking any object’s property<\/p>\n\n\n\n
syntax: <\/strong>obj.hasOwnProperty(propertyName)<\/amp-fit-text><\/p>\n\n\n\n
<script>\nlet obj = {\n  firstName: 'john'\n};\nconsole.log(Object.hasOwnProperty('keys'));     \/\/true\nconsole.log(obj.hasOwnProperty('firstName'));  \/\/true\nconsole.log(obj.hasOwnProperty('lastName'));  \/\/false\n<\/script><\/pre>\n\n\n\n
That’s it in this blog. I hope this blog was useful to you. Please ask if you have any queries in the comment section.<\/p>\n","protected":false},"excerpt":{"rendered":"
Hey, do you know javascript has some Object methods and you can manipulate your object by using that. We will look into such methods in this blog. Before starting, let’s observe master obj (Object) closely Please see below result As you can see above, some methods are listed like assign, create, freeze, etc so we […]<\/a><\/p>\n","protected":false},"author":224,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-224766","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJavascript Object methods - Webkul Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/webkul.com\/blog\/javascript-object-methods\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Javascript Object methods - Webkul Blog\" \/>\n<meta property=\"og:description\" content=\"Hey, do you know javascript has some Object methods and you can manipulate your object by using that. We will look into such methods in this blog. Before starting, let’s observe master obj (Object) closely Please see below result As you can see above, some methods are listed like assign, create, freeze, etc so we [...]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/webkul.com\/blog\/javascript-object-methods\/\" \/>\n<meta property=\"og:site_name\" content=\"Webkul Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/webkul\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-01-22T15:37:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-01-23T12:57:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/webkul.com\/blog\/wp-content\/uploads\/2020\/01\/master_object_result.png\" \/>\n<meta name=\"author\" content=\"Prabhat Kumar\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@webkul\" \/>\n<meta name=\"twitter:site\" content=\"@webkul\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Prabhat Kumar\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/webkul.com\/blog\/javascript-object-methods\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/webkul.com\/blog\/javascript-object-methods\/\"},\"author\":{\"name\":\"Prabhat Kumar\",\"@id\":\"https:\/\/webkul.com\/blog\/#\/schema\/person\/50845eb980b8da8dea2def8904ec5566\"},\"headline\":\"Javascript Object methods\",\"datePublished\":\"2020-01-22T15:37:18+00:00\",\"dateModified\":\"2020-01-23T12:57:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/webkul.com\/blog\/javascript-object-methods\/\"},\"wordCount\":570,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/webkul.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/webkul.com\/blog\/javascript-object-methods\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/webkul.com\/blog\/wp-content\/uploads\/2020\/01\/master_object_result.png\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/webkul.com\/blog\/javascript-object-methods\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/webkul.com\/blog\/javascript-object-methods\/\",\"url\":\"https:\/\/webkul.com\/blog\/javascript-object-methods\/\",\"name\":\"Javascript Object methods - 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We will look into such methods in this blog. Before starting, let’s observe master obj (Object) closely Please see below result As you can see above, some methods are listed like assign, create, freeze, etc so we [...]","og_url":"https:\/\/webkul.com\/blog\/javascript-object-methods\/","og_site_name":"Webkul Blog","article_publisher":"https:\/\/www.facebook.com\/webkul\/","article_published_time":"2020-01-22T15:37:18+00:00","article_modified_time":"2020-01-23T12:57:19+00:00","og_image":[{"url":"https:\/\/webkul.com\/blog\/wp-content\/uploads\/2020\/01\/master_object_result.png","type":"","width":"","height":""}],"author":"Prabhat Kumar","twitter_card":"summary_large_image","twitter_creator":"@webkul","twitter_site":"@webkul","twitter_misc":{"Written by":"Prabhat Kumar","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/webkul.com\/blog\/javascript-object-methods\/#article","isPartOf":{"@id":"https:\/\/webkul.com\/blog\/javascript-object-methods\/"},"author":{"name":"Prabhat Kumar","@id":"https:\/\/webkul.com\/blog\/#\/schema\/person\/50845eb980b8da8dea2def8904ec5566"},"headline":"Javascript Object methods","datePublished":"2020-01-22T15:37:18+00:00","dateModified":"2020-01-23T12:57:19+00:00","mainEntityOfPage":{"@id":"https:\/\/webkul.com\/blog\/javascript-object-methods\/"},"wordCount":570,"commentCount":0,"publisher":{"@id":"https:\/\/webkul.com\/blog\/#organization"},"image":{"@id":"https:\/\/webkul.com\/blog\/javascript-object-methods\/#primaryimage"},"thumbnailUrl":"https:\/\/webkul.com\/blog\/wp-content\/uploads\/2020\/01\/master_object_result.png","inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/webkul.com\/blog\/javascript-object-methods\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/webkul.com\/blog\/javascript-object-methods\/","url":"https:\/\/webkul.com\/blog\/javascript-object-methods\/","name":"Javascript Object methods - 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