The function.caller property of the JavaScript function object returns the function that invoked the specified function. It returns null if the function "f" was invoked by the top-level code in JavaScript. For functions like strict functions, async functions, and generator functions this method returns null.
Syntax:
function.caller
Parameters: This function does not accept any parameter.
Return Value: This function returns null for strict, async function, and generator function callers.
A few examples are given below for a better understanding of the function methods.
Example 1: This example shows the basic use of the Javascript function.caller property.
// Creating func2
function func2() {
console.log("This is from function 2")
}
// Creating func1
function func1() {
func2();
}
// Call Function 1
func1();
// null is returned as function
// is strict, async function and
// generator function
console.log("from function.caller: ",
func1.caller)
Output:
This is from function 2 from function.caller: null
Example 2: This example shows the basic use of the Javascript function.caller property.
function myFunc() {
if (myFunc.caller == null)
console.log("The function "
+ "was called from the top!");
else
console.log("This function's "
+ "caller was " + myFunc.caller);
}
myFunc()
Output:
The function was called from the top!
We have a complete list of Javascript Function methods, to check those please go through this Javascript Function Complete reference article.
Browsers Supported:
- Google Chrome 1 and above
- Microsoft Edge 12 and above
- Mozilla Firefox 1 and above
- Internet Explorer 8 and above
- Safari 3 and above
- Opera 9.6 and above