In ruby, there is a beautiful method that is called .try that allows to access object attributes/methods without risking to get an error.
Eg.
{hello: 'world'}.try(:[], :hello) # 'world'
nil.try(:[], :hello) # nil (no error)
Is there a way to achieve this syntax in ES6 elegantly?
For now, I keep writing the ugly:
if (object && object.key && object.key.subkey) {
return object.key.subkey
}
Thanks
I use lodash _.get:
https://lodash.com/docs/4.17.5#get
e.g.
_.get(object, 'property', null);
Very handy.. if the object doesn't exist it falls back to default passed, e.g. null.
It's really good with deeply nested objects.
e.g.
_.get(object, 'a.b.c.d', 'default');
And some examples from the lodash docs:
var object = { 'a': [{ 'b': { 'c': 3 } }] };
_.get(object, 'a[0].b.c');
// => 3
_.get(object, ['a', '0', 'b', 'c']);
// => 3
_.get(object, 'a.b.c', 'default');
// => 'default'
a.b.c.d). Would be nicer to have another operand like object~key~subkey for instance.
Try does exist in ES6, it's a little different though. It requires a catch, though, we can leave the catch doing nothing, this is not advised.
const obj = {hello: 'world'};
//passes so does the console log
try{console.log(obj.hello)} catch(e){}
//fails so does nothing
try{console.log(nil.hello)} catch(e){}