index.js
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'use strict';
var toString = Object.prototype.toString;
/**
* Extract names from functions.
*
* @param {Function} fn The function who's name we need to extract.
* @returns {String} The name of the function.
* @public
*/
module.exports = function name(fn) {
if ('string' === typeof fn.displayName && fn.constructor.name) {
return fn.displayName;
} else if ('string' === typeof fn.name && fn.name) {
return fn.name;
}
//
// Check to see if the constructor has a name.
//
if (
'object' === typeof fn
&& fn.constructor
&& 'string' === typeof fn.constructor.name
) return fn.constructor.name;
//
// toString the given function and attempt to parse it out of it, or determine
// the class.
//
var named = fn.toString()
, type = toString.call(fn).slice(8, -1);
if ('Function' === type) {
named = named.substring(named.indexOf('(') + 1, named.indexOf(')'));
} else {
named = type;
}
return named || 'anonymous';
};