alanszlosek · January 6, 2014 22:16
diff --git a/gistfile1.html b/gistfile1.html
 <html>
 <head>
 <script>
 /*
 Descends into an array or JSON object, looking for the specified elements
 If one is not found, the fallback value (first argument) will be returned
 Trying to alleviate the mix of error checking and object access that can litter code
 */
 Object.prototype.dive = function() {
    var source = this;
    var fallback = arguments[0];
    console.log('diving into:');
    console.log(source);

    for (var i = 1; i < arguments.length; i++) {
        var element = arguments[i];
        console.log('considering: ' + element);
        if (typeof(element) == "string") {
            if (source.hasOwnProperty(element)) {
                source = source[element];
            } else {
                return fallback;
            }
        } else { // assume numeric
            if (source.length >= element) {
                source = source[ element ];
            } else {
                return fallback;
            }
            
        }
    }
    return source;
 };

 function test() {
    var data = {
        'response': {
            'content': {
                'errors': [
                    'one', 'two'
                ]
            }
        }
    };

    console.log( data.dive({}, 'response', 'content', 'errors', 1));
 }

 </script>
 </head>
 <body>
 <button onclick="test();">Click me</button>
 </body>
 </html>
	<html>
	<head>
	<script>
	/*
	Descends into an array or JSON object, looking for the specified elements
	If one is not found, the fallback value (first argument) will be returned
	Trying to alleviate the mix of error checking and object access that can litter code
	*/
	Object.prototype.dive = function() {
	var source = this;
	var fallback = arguments[0];
	console.log('diving into:');
	console.log(source);

	for (var i = 1; i < arguments.length; i++) {
	var element = arguments[i];
	console.log('considering: ' + element);
	if (typeof(element) == "string") {
	if (source.hasOwnProperty(element)) {
	source = source[element];
	} else {
	return fallback;
	}
	} else { // assume numeric
	if (source.length >= element) {
	source = source[ element ];
	} else {
	return fallback;
	}

	}
	}
	return source;
	};

	function test() {
	var data = {
	'response': {
	'content': {
	'errors': [
	'one', 'two'
	]
	}
	}
	};

	console.log( data.dive({}, 'response', 'content', 'errors', 1));
	}

	</script>
	</head>
	<body>
	<button onclick="test();">Click me</button>
	</body>
	</html>