destructure a property from a null value. To solve the error provide a fallback when destructuring the property, e.g. By clicking Sign up for GitHub, you agree to our terms of service and (empty string), NaN (not a number). The function I want to test is this one: componentDidMount () { this.fetchUser (); } And it is depended on this one: fetchUser = () => { getUser (this.getUserUsername ()).then (username => { this.setState ( { user: username.data }); }); }; undefined instead of throwing an error. This is even simpler if you convert your Total component to a functional component. elementor - v3.9.2 - 21-12-2022 */ Which basically returns right-side value, if the left-side value is null or undefined (our case with undefined instead of an object). Would you ever say "eat pig" instead of "eat pork"? A less idiomatic (see this comment) way is to spread the content into an object before destructuring it, because null and undefineds values are ignored. So, if content is undefined -> item will also be undefined. {} console.log(item) // undefined So consider using the operator. Have a question about this project? Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers). What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Looking for job perks? Jestnext Is there a weapon that has the heavy property and the finesse property (or could this be obtained)? How a top-ranked engineering school reimagined CS curriculum (Ep. This cookie is set by GDPR Cookie Consent plugin. Unpacking values from a regular expression match. Here's an example of how the error occurs. I think of it as a potential use for spread. You can learn more about the related topics by checking out the following That's just a matter of taste, in our team, we have an agreement: we use ?? How to combine independent probability distributions? you are using old api on new version of solc. Can I use my Coinbase address to receive bitcoin? When should I use curly braces for ES6 import? You need to make sure that you are exporting everything correctly from your compile.js file to your test file. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @Bergi - I'll not argue about the efficiency as it depends on what you're doing with it. Ethereum Stack Exchange is a question and answer site for users of Ethereum, the decentralized application platform and smart contract enabled blockchain. The optional chaining operator allows us to safely access deeply nested nullish My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Why do men's bikes have high bars where you can hit your testicles while women's bikes have the bar much lower? Cannot destructure Property of Undefined error in JS [Fixed] - bobbyhadz result. Why did DOS-based Windows require HIMEM.SYS to boot? if event data is undefined then: One can unpack undefined value, but can't unpack from undefined. How to convert a sequence of integers into a monomial, English version of Russian proverb "The hedgehogs got pricked, cried, but continued to eat the cactus". error. I used the code in another part of the code and its working. Embedded hyperlinks in a thesis or research paper, Counting and finding real solutions of an equation. Solidity compiler throwing [ ':1:1: ParserError: Expected pragma, import directive or contract/interface/library definition.\n, Cant get the ABI and Interface of solidity code. Did the drapes in old theatres actually say "ASBESTOS" on them? What video game is Charlie playing in Poker Face S01E07? My guess is that compile is failing, likely because of this, Solidity Error: Cannot destructure property `interface` of 'undefined' or 'null', ethereum.stackexchange.com/questions/63267/. :