Demo entry 6783733

How to use Object.freeze


Submitted by anonymous on Feb 19, 2019 at 16:27
Language: JavaScript. Code size: 452 Bytes.

'use strict'

//Notice the 'use strict' above, if this is not used you will not see an error.

//Declare our immutable object using the "const" keyword.
const myImmutableObject = {
    property1: 42
  const myReallyImmutableObject = Object.freeze(myImmutableObject);
  myReallyImmutableObject.property1 = 33;
  // Throws an error in strict mode
  // expected output: 42

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