Prevent Object Mutation

This shows how you can lock an object so its content cannot be modified. if you comment out the line Object.freeze(my_object); it will allow it to be modified again.

Demo

JS

function run_function() {
  let my_object = {
    i: "am awesome",
  }
  Object.freeze(my_object);
  my_object.i = "am still awesome"; // this should not change the object as its frozen
  write_result(my_object);
  console.log(my_object);
  return my_object;
}

// this is a common function just to write the content into the result div
function write_result(result) {
  var result_html = document.getElementById("result");
  result_html.innerHTML = result;
}

HTML

<div id='result' class='mb-3 alert alert-primary'>..</div>
<button onclick='run_function();' class='btn btn-primary mb-1'>Run Function</button>

Working Result

..

External Link for Prevent Object Mutation

Other Items in javascript
Page Views

This page has been viewed 118 times.

Search Code
Search Code by entering your search text above.
Welcome

This is my test area for webdev. I keep a collection of code snippits here, mostly for my reference. Also if i find a good site, i usually add it here.

❤👩‍💻🕹