Last Updated : 12 Jul, 2025
JavaScript handler.apply() method in JavaScript is used as a trap for a function call. The value returned by this method is used as the result of a function call through a proxy.
Syntax:
const p = new Proxy(target, {
apply: function(target, thisArg, argumentsList) {
}
});
Parameters: This method accepts three parameters as mentioned above and described below:
Return value: This method returns any value.
Below examples illustrate the handler.apply() method in JavaScript:
Example 1: In this example, we will calculate the sum of the numbers using the handler.apply() method in JavaScript.
javascript
function sum(a, b) {
return a + b;
}
const handler = {
apply: function (target, thisArg, argumentsList) {
console.log(`Calculate sum: ${argumentsList}`);
return target(argumentsList[0], argumentsList[1]) * 14 / 3;
}
};
const proxy1 = new Proxy(sum, handler);
console.log(sum(23, 4));
console.log(proxy1(23, 4));
Output:
27 "Calculate sum: 23, 4" 126
Example 2: In this example, we will print values using the handler.apply() method in JavaScript.
javascript
let str = function (arg1, arg2) {
console.log('geeks get (' + arg1 + ', ' + arg2 + ')');
};
let proxy = new Proxy(str, {
apply: function (target, thisArg, parameters) {
console.log('Geeksforgeeks');
return target.apply(thisArg, parameters);
}
});
proxy('Tutorial', 'Jobs');
proxy.apply(null, ['Knowledge', 'internships']);
proxy.call(null, 'Stipend', 'skills');
Output:
"Geeksforgeeks" "geeks get (Tutorial, Jobs)" "Geeksforgeeks" "geeks get (Knowledge, internships)" "Geeksforgeeks" "geeks get (Stipend, skills)"
Supported Browsers: The browsers supported by JavaScript handler.apply() method are listed below:
We have a complete list of Javascript Proxy/handler methods, to check those go through the Javascript Proxy/handler Reference article.
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