How to get currently running function name using JavaScript ?
Given a function and the task is to get the name of function that is currently running using JavaScript.
- Approach 1: Using arguments.callee method: It refers to the currently executing function inside the function body of that function. In this method, we use arguments.callee to refer to the name of the function. So we define a new variable as arguments.callee.toString(). Then we use (variable_name).substr to get the function and then we display it as an alert.
Syntax:
arguments.callee.toString()
You may have to parse the name though, as it will probably include some extra junk.
Example 1: This example display currently running function using arguments.callee method.
<!DOCTYPE HTML><html><head><title>How to get currently runningfunctionname using JavaScript ?</title></head><body style ="text-align:center;"><h1 style ="color:green;">GeeksForGeeks</h1><script>functionGFGs() {varme = arguments.callee.toString();me = me.substr('function '.length);me = me.substr(0, me.indexOf('('));alert(me);}GFGs();</script></body></html>Output:
- Approach 2: With the help of console.log method, we define a new function which returns the name of the function and call it the present function.
Syntax:
function getFuncName() { return getFuncName.caller.name } function teddy() { console.log(getFuncName()) } teddy()Example 2: This example display currently running function using console.log method.
<!DOCTYPE html><html><head><title>How to get currently runningfunctionname using JavaScript ?</title></head><body style ="text-align:center;"><h1 style ="color:green;">GeeksForGeeks</h1><script>functiongetFuncName() {returngetFuncName.caller.name}functionteddy() {console.log(getFuncName())}teddy()</script></body></html>Output:
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