Javascript Reflect.apply() method is a standard build-in object in JavaScript which is used to call a function using the specified argument. It works similar to the Function.prototype.apply() method to call a function, but in an efficient manner and easy to understand.
Syntax:
Reflect.apply(target, thisArgument, argumentsList)
Parameters: This method accepts three parameters as mentioned above and described below:
- target: This parameter is the target function that is going to be called.
- thisArgument: This parameter has this value which is required for calling the target function.
- ArgumentsList: This parameter is an array-like object specifying the argument with which the target should be called.
Return Value: Calling the given Target function resulted in the specified this value and arguments.
Exceptions: A TypeError is an exception given as the result when the target is not callable.
Below examples illustrate the Reflect.apply() Method in JavaScript:
Example 1: List argument is passed and dictionary – the object is created.
javascript
function neveropen1(a, b, c) { this.x = a; this.y = b; this.z = c; } const obj = {}; Reflect.apply(neveropen1, obj, [12, 42, 32]); console.log(obj); |
Output:
{ x: 12, y: 42, z: 32 }
Example 2: In this example, the empty list argument is passed and the function is called. And the second portion contains mathematical computation, finding the minimum element from the list.
javascript
let neveropen2 = function () { console.log(this); } Reflect.apply(neveropen2, 'neveropen', []); let list = [31, 45, 143, 5]; console.log(Reflect.apply(Math.min, undefined, list)); |
Output:
String { "neveropen" }
5
Example 3: In this example, the list argument is passed with some values and the function is called converting the integer into character strings.
javascript
// Converting the list of integer into char string console.log(Reflect.apply(String.fromCharCode, undefined, [103, 101, 101, 107, 115, 102, 111, 114, 103, 101, 101, 107, 115])) // Extract the indexed value of string(character) console.log(Reflect.apply(''.charAt, 'shubham', [3])) |
Output:
neveropen b
Supported Browsers: The browsers supported by JavaScript Reflect.apply() Method are listed below:
- Google Chrome 49 and above
- Edge 12 and above
- Firefox 42 and above
- Opera 36 and above
- Safari 10 and above
We have a complete list of Javascript Reflects methods, to check those go through the JavaScript Reflect Reference article.
