Most used JS object methods

davemOps · davemOps · commit a6b7c92d9a16 · 2025-08-21T23:35:07.000+03:00
diff --git a/object-methods/main.js b/object-methods/main.js
@@ -0,0 +1,84 @@
+//OBJECTS METHODS
+
+//1. Object.keys(abj) -Returns an array of objects keys(property names)
+
+const user = {
+  id: 1,
+  name: "David",
+  age: 40
+}
+console.log(Object.keys(user))//[ 'id', 'name', 'age' ]
+
+//2. Object.values(abj)-Returns an array of an object values
+
+const user2 = {
+  id: 2,
+  name: "Robert",
+  age: 50
+}
+console.log(Object.values(user2))//[ 2, 'Robert', 50 ]
+
+//3.Object.entries(obj)-Returns an array of key-value pairs
+
+const user3 = {
+  id: 3,
+  name: "Kim",
+  age: 20
+}
+console.log(Object.entries(user3))//[ [ 'id', 3 ], [ 'name', 'Kim' ], [ 'age', 20 ] ]
+
+//4. Object.freeze(obj) -Prevents modification of an object
+
+const user4 = {
+  id: 1,
+  name: "Ann",
+  age: 25
+}
+
+Object.freeze(user4)
+user4.name = "Sarah"//wont change the object value
+user4.age = 35//won't change object value
+console.log(user4)//{ id: 1, name: 'Ann', age: 25 }
+
+
+//5.Object.seal()-Prevents adding/removing properties, but you can still update existing values.
+
+const user5 = {
+  name: "Alice",
+  age: 25
+};
+
+Object.seal(user);
+
+user.age = 30;   // works
+user.city = "Nairobi"; // wont add
+
+console.log(user); // { name: "Alice", age: 30 }
+
+
+
+
+//6.Object.assign()-Copies values from one object to another.
+
+const user6 = {
+  name: "Alice"
+};
+const details = {
+  age: 25,
+  city: "Nairobi"
+};
+
+const merged = Object.assign({}, user, details);
+
+console.log(merged);// { name: "Alice", age: 25, city: "Nairobi" }
+
+
+
+//7. Object.hasOwn() (or hasOwnProperty) -Checks if an object has a specific property.
+
+const user7 = { name: "Alice", age: 25 };
+
+console.log(Object.hasOwn(user7, "name")); // true
+console.log(Object.hasOwn(user7, "city")); // false
+
+
