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JavaScript Reflect has() Method

JavaScript Reflect has() Method with examples on javascript reflect methods, apply() construct(), defineProperty() method, deleteProperty(), get(), getOwnPropertyDescriptor(), getPrototypeOf(), has(), isExtensible(), ownKeys(), setPrototypeOf() etc.

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JavaScript Reflect.has() Method

The static Reflect.has() method is used to check if a property exists in an object. It works like the in operator as a function.

Syntax:

Reflect.has(target, propertyKey)

Parameters:

target: It is the object in which to look for the property.

propertyKey: It is the name of the property to check.

Return value:

It returns a Boolean which indicates whether or not the target has the property.

Exceptions:

A TypeError, if the target is not an Object.

Browser Support:

Chrome 49
Edge 12
Firefox 42
Opera 36

Example 1

const object1 = {
  property1: 42
};
console.log(Reflect.has(object1, 'property1'));

Output:

 true

Example 2

const object1 = {
  property1: 42
};
console.log(Reflect.has(object1, 'property2'));

Output:

 false

Example 3

var x = { foo: 1 };
console.log(Reflect.has(x, 'foo'));
console.log('foo' in x);
console.log(Reflect.has(x, 'bar'));
console.log('bar' in x);

Output:

true
true
false

false
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