Pikuseru/bunkum.html

## bunkum.html
<!DOCTYPE html>
<html lang="en">
<head>
    <title>bunkum</title>
    <script src="bunkum.js"></script>
</head>
<body>
</body>
</html>

## bunkum.js
//
// validation decorator functions
//

var Validators = {
    number: function (fn) {
        return function (parameter) {
            if (typeof parameter === 'number') {
                fn(parameter);
            } else {
                throw parameter + ' is not a number';
            }
        }
    },
    positiveNumber: function (fn) {
        return Validators.number(function (parameter) {
            if (parameter >= 0) {
                fn(parameter);
            } else {
                throw parameter + ' is not positive'
            }
        })
    }
};

//
// logging decorator function
//

var Logging = {
    mode: '',
    log: function (fn) {
        return function () {
            try {
                fn.apply(null, arguments);
            }
            catch (e) {
                if (Logging.mode === 'errors') {
                    console.error(e);
                }
                throw e;
            }
        }
    }
};

//
// decorate the application operations we want to expose
//

var BuildObject = function () {
    return {
        doSomething1: Logging.log(Validators.number(function (parameter) {
            console.log('doSomething1 with ' + parameter);
        })),
        doSomething2: Logging.log(Validators.positiveNumber(function (parameter) {
            console.log('doSomething2 with ' + parameter);
        }))
    };
};

var test = function () {
    var object = BuildObject();

    try {
        object.doSomething1(5);
    } catch (e) {
    }

    try {
        object.doSomething1('foo');
    } catch (e) {
    }

    try {
        object.doSomething2(1);
    } catch (e) {
    }

    try {
        object.doSomething2(-1);
    } catch (e) {
    }
};

console.log('logging off');
test();

console.log('logging errors');
Logging.mode = 'errors';
test();
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>bunkum</title>
	<script src="bunkum.js"></script>
	</head>
	<body>
	</body>
	</html>
	//
	// validation decorator functions
	//

	var Validators = {
	number: function (fn) {
	return function (parameter) {
	if (typeof parameter === 'number') {
	fn(parameter);
	} else {
	throw parameter + ' is not a number';
	}
	}
	},
	positiveNumber: function (fn) {
	return Validators.number(function (parameter) {
	if (parameter >= 0) {
	fn(parameter);
	} else {
	throw parameter + ' is not positive'
	}
	})
	}
	};

	//
	// logging decorator function
	//

	var Logging = {
	mode: '',
	log: function (fn) {
	return function () {
	try {
	fn.apply(null, arguments);
	}
	catch (e) {
	if (Logging.mode === 'errors') {
	console.error(e);
	}
	throw e;
	}
	}
	}
	};

	//
	// decorate the application operations we want to expose
	//

	var BuildObject = function () {
	return {
	doSomething1: Logging.log(Validators.number(function (parameter) {
	console.log('doSomething1 with ' + parameter);
	})),
	doSomething2: Logging.log(Validators.positiveNumber(function (parameter) {
	console.log('doSomething2 with ' + parameter);
	}))
	};
	};

	var test = function () {
	var object = BuildObject();

	try {
	object.doSomething1(5);
	} catch (e) {
	}

	try {
	object.doSomething1('foo');
	} catch (e) {
	}

	try {
	object.doSomething2(1);
	} catch (e) {
	}

	try {
	object.doSomething2(-1);
	} catch (e) {
	}
	};

	console.log('logging off');
	test();

	console.log('logging errors');
	Logging.mode = 'errors';
	test();