1.7 KiB
1.7 KiB
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Object Is |
Object Is
Description
The object.is()
method is used to determine if two values are the same value. This method was introduced in ES6.
Syntax
Object.is(val1, val2)
Parameters
val1 - first value to compare
val2 - second value to compare
Return value
A Boolean indicating whether the two arguments have the same value
Description
Object.is()
compares two values for sameness, returning true
if both values meet one of the following conditions:
undefined
null
- Both
true
or bothfalse
- String of the same length and same characters
- Same object
- Both numbers and:
- Both
+0
or both-0
- Both
NaN
- or both a number that is not zero and not
NaN
- Both
Examples
Object.is('string', 'string'); // true
Object.is(undefined, undefined); // true
Object.is(null, null); // true
Object.is('string, 'word'); // false
Object.is(true, false); // false
Object.is([], []); //false
var obj = {name: Jane};
Object.is(obj, obj); // true
Object.is(NaN, NaN); // true
Object.is(+0, -0); // false
Object.is(-0, -0); // true