What is the use of Object.is() method in JavaScript?

JavascriptObject Oriented ProgrammingFront End Technology

Object.is()

Object.is() is used to check whether two values are same or not. 

Two values are same when they have the following criteria. 

  • Either both the values are undefined or null .
  • Either both are true or false.
  • Both strings should be of same length, same characters and in same order.
  • The polarities of both the values should be equal.
  • Both the values can be NaN and should be equal.

syntax

Object.is(val1, val2);

It accepts two parameters and scrutinize whether they are equal or not. If equal gives out true as output else false as output.

There is a small difference between Object.is() and "==" that is when comparing +0 and -0, the former results false whereas the latter results true. From this we can conclude that the method Object.is() scrutinizes even polarity.

Example

Live Demo

<html>
<body>
<script>
   // comparing strings with same characters and same order
   var val = Object.is("tutorialspoint", "tutorialspoint")
   document.write(val);
   document.write("</br>");
   // comparing polarity
   var pol = Object.is(-0, +0)
   document.write(pol);
   document.write("</br>");
   //comparing unequal strings
   var uneq = Object.is("tutorialspoint!", "tutorialspoint")
   document.write(uneq);
   document.write("</br>");
   // comparing objects
   var obj = Object.is( {object : 1}, {object : 2})
   document.write(obj);
</script>
</body>
</html>

Output

true
false
false
false
raja
Published on 25-Jun-2019 14:32:17
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