Javascript Object getOwnPropertyNames() Method

by Online Tutorials Library July 22, 2022

JavaScript Object.getOwnPropertyNames() Method

The Object.getOwnPropertyNames() method returns an array of all properties (except those non-enumerable properties which use symbol) found directly upon a given object.

Syntax:

Parameter:

obj: It is the object whose enumerable and non-enumerable own properties are to be returned.

Return value:

This method returns an array of string that correspond to the properties found directly upon the object.

Browser Support:

Chrome	5
Edge	Yes
Firefox	4
Opera	12

Example 1

  const object1 = {    a: 0,    b: 1,    c: 2,  };  console.log(Object.getOwnPropertyNames(object1));  

Output:

["a", "b", "c"]

Example 2

   var obj = { 0: ‘a’, 1: ‘b’, 2: ‘c’ };  console.log(Object.getOwnPropertyNames(obj).sort()); // logs ‘0,1,2’    // Logging property names and values using Array.forEach    Object.getOwnPropertyNames(obj).forEach(function(val, idx, array) {    console.log(val + ‘ -> ‘ + obj[val]);    });  

Output:

["0", "1", "2"]   "0 -> a"   "1 -> b"   "2 -> c"

Example 3

  function Pasta(grain, size, shape) {      this.grain = grain;       this.size = size;       this.shape = shape;   }  var spaghetti = new Pasta(“wheat”, 2, “circle”);  var names = Object.getOwnPropertyNames(spaghetti).filter(CheckKey);  document.write(names);    // Check whether the first character of a string is ‘s’.   function CheckKey(value) {      var firstChar = value.substr(0, 1);       if (firstChar.toLowerCase() == ‘s’)          return true;       else           return false; }  

Output:

size,shape

Next TopicJavaScript Objects

defineProperties()defineProperty()entries()freeze()getOwnPropertySymbols()getPrototypeOf()javascript javascript array javascript tutorial object

Javascript Object getOwnPropertyNames() Method

JavaScript Object.getOwnPropertyNames() Method

Syntax:

Parameter:

Return value:

Browser Support:

Example 1

Example 2

Example 3

JavaScript Symbol

Kotlin Array

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