Is there a better method to verify if an object property, such as obj.prop.otherprop.another, exists?
if(obj && obj.prop && obj.prop.otherprop && obj.prop.otherprop.another)
While this solution is effective, it may be considered cumbersome.
Is there a better method to verify if an object property, such as obj.prop.otherprop.another, exists?
if(obj && obj.prop && obj.prop.otherprop && obj.prop.otherprop.another)
While this solution is effective, it may be considered cumbersome.
The most effective method for this task involves using a try{} catch(exception){} block to verify the existence of obj.prop.otherprop.another. This approach ensures efficiency by handling any exceptions that may arise if the required properties do not exist.
var result = null;
try {
result = obj.prop.otherprop.another;
} catch(error) {
obj = obj || {};
obj.prop = obj.prop || {};
obj.prop.otherprop = obj.prop.otherprop || {};
obj.prop.otherprop.another = {};
result = obj.prop.otherprop.another ;
}
Not necessarily claiming this method is superior, however...
x = null
try {
x = obj.prop.otherprop.another;
} catch() {}
// ...
On the other hand...
function find(obj, path) {
path = path.split('.');
while (path.length && obj) obj = obj[path.shift()];
return obj;
}
x = find(obj, 'prop.otherprop.another');
... but it seems like there isn't a universally recognized best approach for this particular issue. At least not as far as I am aware.
Feeling a bit playful? Try this out:
if ((((car || {}).engine || {}).wheels || {}).tires) { ... }
However, creating three new objects just to avoid typing the path multiple times may not be the most efficient approach.
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