JavaScript function caller Property
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.
Javascript
// 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.
Javascript
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
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