@James : thanks for this, altohugh I have to admit I am scripting (a
lot) outside of the browser context, ie, in windows scripts, so I have
not experienced this fenomenon: how can "".constructor be something
else than "function String() {...}" ?
In any case here is my code I am using for is<T>() functionality. And
it works for me.
Although I can not swear I ever tested this inside <iframe> ?
I hope this might give some idea to good jQuery developers, when
battling with javascript type system ;o)
--DBJ
// String.trim() ECMA5
if ("function" !== typeof "".trim)
String.prototype.trim = function() { return this.replace(/^\s+|
\s+$/g, ''); }
// type discovery helpers avoiding the 'typeof' usage
dbj.isWhat = function(x) {
return ("" + x.constructor).split("(")[0].split("function")
[1].trim();
}
// is<T>() function generator
dbj.isWhat.gener = function(names, root) {
for (var n in names) {
root["is" + names[n]] = Function("x", " return dbj.isWhat
(x) === '" + names[n] + "'")
}
}
// generate is<T>() functions by using constructor names
// which are capitalised vs type names
dbj.isWhat.gener(["Array", "Object", "Function", "String",
"Number"], dbj)
// TESTING
// USAGE: dbj.isWhat.test()
dbj.isWhat.test = function() {
function E(S) { return "\n" + S + "\t--> " + eval(S); }
function T(X) {
return E('dbj.isArray(' + X + ')') + E('dbj.isObject(' + X
+ ')') +
E('dbj.isFunction(' + X + ')') +
E('dbj.isString(' + X + ')') + E('dbj.isNumber(' + X + ')');
}
var s = "";
for (var n in { '[]': 1, '{}': 2, 'Function()': 3, "''": 4,
"1": 5 })
s += "\n" + T(n);
return s;
}
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