Created
January 6, 2014 22:16
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| <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> |
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