Javascript Object seal() Method

by Online Tutorials Library July 22, 2022

JavaScript Object.seal() Method

The Object.seal() method of JavaScript seals an object which prevents new properties from being added to it and marks all existing properties as non-configurable. The object to be sealed is passed as an argument, and the method returns the object which has been sealed.

Syntax:

Parameter:

obj: It is the object which should be sealed.

Return value:

The Object.sealed() method returns the object which has been sealed.

Browser Support:

Chrome	6
Edge	Yes
Firefox	4
Opera	12

Example 1

  const obj1 = { property1: ‘Marry’};          const obj2 = Object.seal(obj1);         // prevents other code from deleting properties of an object.          obj2.property1 = ‘carry’;          console.log(obj2.property1);  

Output:

"carry"

Example 2

   const object1 = {    property1: 29  };  Object.seal(object1);  // Prevents other code from deleting properties of an object.  object1.property1 =45;  console.log(object1.property1);  delete object1.property1;     // cannot delete when sealed  

Output:

Example 3

  const object1 = {    property1: 42  };  Object.seal(object1);  object1.property1 = 45;  console.log(object1.property1);    delete object1.property1; // cannot delete when sealed  console.log(object1.property1);    const object2 = {    property2: 45};  object2.property2 =67;  console.log(object2.property2);  

Output:

45  45  67

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Javascript Object seal() Method

JavaScript Object.seal() Method

Syntax:

Parameter:

Return value:

Browser Support:

Example 1

Example 2

Example 3

JavaScript Symbol

Kotlin Array

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