Could return
1.true // gives true because does not do strict checking
function is_callable (v, syntax_only, callable_name) {
// Returns true if var is callable.
//
// version: 902.821
// discuss at: http://phpjs.org/functions/is_callable
// + original by: Brett Zamir
// % note 1: The variable callable_name cannot work as a string variable passed by reference as in PHP (since JavaScript does not support passing strings by reference), but instead will take the name of a global variable and set that instead
// % note 2: When used on an object, depends on a constructor property being kept on the object prototype
// * example 1: is_callable('is_callable');
// * returns 1: true
// * example 2: is_callable('bogusFunction', true);
// * returns 2:true // gives true because does not do strict checking
// * example 3: function SomeClass () {}
// * example 3: SomeClass.prototype.someMethod = function(){};
// * example 3: var testObj = new SomeClass();
// * example 3: is_callable([testObj, 'someMethod'], true, 'myVar');
// * example 3: alert(myVar); // 'SomeClass::someMethod'
var name='', obj={}, method='';
if (typeof v === 'string') {
obj = window;
method = v;
name = v;
}
else if (v instanceof Array && v.length === 2 && typeof v[0] === 'object' && typeof v[1] === 'string') {
obj = v[0];
method = v[1];
name = (obj.constructor && obj.constructor.name)+'::'+method;
}
else {
return false;
}
if (syntax_only || typeof obj[method] === 'function') {
if (callable_name) {
window[callable_name] = name;
}
return true;
}
return false;
}
