Reflect.has() JavaScript

The JavaScript Reflect.has() method determines if a property exists in an object. It is similar to in operator as a function.

Syntax:

Reflect.has(target, propertyKey)

Parameters:
target: It represents the object on which property existing check have to be perform.
propertyKey: It represents the name of the property to check.

Return:
It returns true if the specified property is exist in the object otherwise returns false.

Note: It throws TypeError, if target is not an Object.

Example 1:

<!DOCTYPE html>
<html>
<body>
<script>
const obj = {prop:100};  
document.write(Reflect.has(obj, 'prop'));   
</script>
</body>
</html>

Output:

true

Example 2:

<!DOCTYPE html>
<html>
<body>
<script>
 
const object1 = {
  property1: "w3spoint"
};
 
document.write(Reflect.has(object1, 'property1'));
document.write("</br>");
document.write(Reflect.has(object1, 'property2'));
document.write("</br>");
document.write(Reflect.has(object1, 'toString'));
 
</script>
</body>
</html>

Output:

true
false
true

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