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What is the use of Object.is() method in JavaScript?
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
<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
Updated on: 30-Jul-2019
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