Is it possible to reference this function's name? For example:
'use strict'
function myClass(){}
myClass.prototype.myName = function myName(data,callback){
console.log("This function has been called: " + "{???}"); // "myName"
}
myClass.prototype.myAge = function(data,callback){
console.log("This function has been called: " + "{???}"); // "myAge"
}
var a = new myClass();
a.myName(); // 'myName'
a.myAge(); // 'myAge';
How can I reference "myName" in strict mode like that?
If this is just for debugging, you can use the following, which uses the stack trace to find a function's name, taking advantage of the browser magic that it does to find the "names" of functions. Tested in FF, Chrome and IE 10.
function MyClass() {};
MyClass.prototype.myName = function() {
console.log(getCallerName(), 'I am here');
};
MyClass.prototype.myOtherName = function() {
console.log(getCallerName(), 'I am here again');
};
function doMe() {
console.log(getCallerName(), 'I am here in a named function');
};
function getCallerName() {
try {
throw new Error();
} catch (e) {
if (e.stack) {
var lines = e.stack.split('\n');
// FF (Maybe, Opera and Safari)
var ffMatch = /\b([a-zA-Z1-9\$_\.]*)@/.exec(lines[1]);
if (ffMatch) {
return ffMatch[1];
}
// IE 10+ and chrome
var chromeMatch = /at (.*) /.exec(lines[2]);
if (chromeMatch) {
return chromeMatch[1];
}
}
return 'unknown function';
}
}
var a = new MyClass();
a.myName();
a.myOtherName();
doMe();Play with it at http://jsfiddle.net/ob0w4z3k/5/
You can use myName.name:
(function myName(){
console.log("This functions name is " + myName.name);
})(); // "This functions name is myName"
However, note that this was introduced in ECMAScript 6, so most browsers don't support it yet.
Only Firefox has supported it for a long time, because it was a non-standard feature, before ES6 spec was made.
Also see the MDN article.
.name?
arguments.callee but you can't use that because that doesn't work in strict mode.
myName.name you can just type "myName".myName. But in case you don't know that (e.g if you assign the function to another variable or pass it to another function), you can use .name. I think it's not much assuming that, if the OP wants to know the name of a function, he has a reference to the function.
myNameproperty or the named function? You can clarify by not making the function name and the property names the sameconsole.log.Errorinstance and get a stack trace.