JavaScript Object is() Method (original) (raw)
Last Updated : 12 Jul, 2024
JavaScript Object.is() method is used to compare if two values are the same value.
Object.is() r**eturns true if the values are the same, and false otherwise. It differs from the **strict equality operator === in the handling of NaN and positive/negative zero.
**Syntax:
Object.is(value1, value2)
**Parameters:
Object.is() Method takes two parameters:
- **value1: It is the first value to be compared.
- **value2: It is the second value to be compared.
**Return Value:
- Object.is() returns a boolean indicating whether the two arguments are the same or not.
**Example: In this example, Object.is() returns true for the first comparison because both values are 5, but false for the second comparison because 5 and '5' are of different types. It returns true for NaN comparison because NaN is considered the same value as itself, and false for 0 and -0 comparison because they are considered different values.
JavaScript `
console.log(Object.is(5, 5)); // true console.log(Object.is(5, '5')); // false console.log(Object.is(NaN, NaN)); // true console.log(Object.is(0, -0)); // false
`
Output
true false true false
**Exceptions:
- The “==” and “===” operator treats the number values “+0” and “-0” as equal but the object.is() method treats them differently.
- The Object.is() method does not coerce values before comparison even if they are of different data types.
**Two values can be the same if they hold one of the following properties:
- If both the values are undefined.
- If both the values are null.
- If both the values are true or false.
- If both the strings are of the same length with the same characters and in the same order.
- If both the values are numbers and both are “+0” or both are ‘-0’.
- If both the values are numbers and both are “NaN” or both non-zero and both not NaN and both have the same value.
We have a complete list of Javascript Object methods, to check those please go through this JavaScript Object Complete Reference article.