Reflect.get()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
The Reflect.get() static method is like the property accessor syntax, but as a function.
Try it
const object = {
x: 1,
y: 2,
};
console.log(Reflect.get(object, "x"));
// Expected output: 1
const array = ["zero", "one"];
console.log(Reflect.get(array, 1));
// Expected output: "one"
Syntax
Reflect.get(target, propertyKey)
Reflect.get(target, propertyKey, receiver)
Parameters
target-
The target object on which to get the property.
propertyKey-
The name of the property to get.
receiverOptional-
The value of
thisprovided for the call totargetif a getter is encountered. Defaults totarget.
Return value
The value of the property.
Exceptions
TypeError-
Thrown if
targetis not an object.
Description
Reflect.get() provides the reflective semantic of a property access. That is, Reflect.get(target, propertyKey, receiver) is semantically equivalent to:
target[propertyKey];
Note that in a normal property access, target and receiver would observably be the same object.
Reflect.get() invokes the [[Get]] object internal method of target.
Examples
Using Reflect.get()
// Object
const obj1 = { x: 1, y: 2 };
Reflect.get(obj1, "x"); // 1
// Array
Reflect.get(["zero", "one"], 1); // "one"
// Proxy with a get handler
const obj2 = new Proxy(
{ p: 1 },
{
get(t, k, r) {
return `${k}bar`;
},
},
);
Reflect.get(obj2, "foo"); // "foobar"
// Proxy with get handler and receiver
const obj3 = new Proxy(
{ p: 1, foo: 2 },
{
get(t, prop, receiver) {
return `${receiver[prop]}bar`;
},
},
);
Reflect.get(obj3, "foo", { foo: 3 }); // "3bar"
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-reflect.get |
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Legend
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