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  • JS Principles
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      • typeof operator
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      • Conditional (ternary) operator
        • Coercion vs Conversion
      • Event-driven programming
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      • JSON.stringify()
      • Strict mode
      • super() keyword
      • What are memory leaks?
      • Micro-tasks within an event loop (Summary)
      • Macro-tasks within an event loop (Summary)
      • null vs undefined
    • Memory Management
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      • Impure vs Pure Functions
      • Factory functions
  • JavaScript Objects & Arrays
    • Introducing JavaScript objects
      • Build-in objects
        • isNaN()
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        • RegExp.prototype.test()
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        • Object.assign()
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        • Object.defineProperty()
        • Object.entries()
        • Object.freeze()
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        • Object.isSealed()
        • Map
      • Standard built-in methods to work with Arrays
        • Array.of()
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        • Array.prototype.unshift()
        • Array.prototype.includes()
        • Array.prototype.flatMap()
      • Prototypal inheritance
        • Inheritance with the prototype chain
        • Inheriting "methods"
  • JavaScript Mid
    • JavaScript & ES
      • Arrow Function
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      • var, let, and const
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      • Synchronous vs Asynchronous
      • Encapsulation
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      • call() - apply() - bind()
      • 'This' keyword
      • Functional Programming
  • Browser
    • Event-driven programming
  • TypeScript
    • The TypeScript Handbook
      • Basic Types
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      • Enums
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      • Implements vs extends
  • Hackerrank Practices
    • Practices and examples
  • JS Math
    • Mathematical
      • JavaScript | Math.E() function
      • Math.abs( ) Method
      • Math.ceil( ) function
      • Math floor()
      • Math.imul( ) Function
      • Math log( ) Method
      • Math max()/min() Method
      • Math pow( ) Method
      • Math.sign( ) Function
      • Math sqrt( ) Method
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  1. JavaScript Objects & Arrays
  2. Introducing JavaScript objects
  3. Objects

Object.isFrozen()

PreviousObject.getPrototypeOf()NextObject.isSealed()

Last updated 4 years ago

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The Object.isFrozen() determines if an object is .

const object1 = {
  property1: 42
};

console.log(Object.isFrozen(object1));
// expected output: false

Object.freeze(object1);

console.log(Object.isFrozen(object1));
// expected output: true

frozen