Null-safe property access (and conditional assignment) in ES6/2015

Question

Is there a null-safe property access (null propagation / existence) operator in ES6 (ES2015/JavaScript.next/Harmony) like ?. in

Answer 1

It's not as nice as the ?. operator, but to achieve a similar result you could do:

user && user.address && user.address.postcode

Since null and undefined are both falsy values (see this reference), the property after the && operator is only accessed if the precedent it not null or undefined.

Alternatively, you could write a function like this:

function _try(func, fallbackValue) {
    try {
        var value = func();
        return (value === null || value === undefined) ? fallbackValue : value;
    } catch (e) {
        return fallbackValue;
    }
}

Usage:

_try(() => user.address.postcode) // return postcode or undefined 

Or, with a fallback value:

_try(() => user.address.postcode, "none") // return postcode or a custom string