Jake Dohm
Jun 4, 2019 ⋅ 4 min read

Cleaning up your Vue.js code with ES6+

Jake Dohm

Recent posts:

Lots of multi-colored blue and purplish rectangles.

Animating dialog and popover elements with CSS @starting-style

Native dialog and popover elements have their own well-defined roles in modern-day frontend web development. Dialog elements are known to […]

Rahul Chhodde
Jul 24, 2024 ⋅ 10 min read
Using Llama Index To Add Personal Data To Large Language Models

Using LlamaIndex to add personal data to LLMs

LlamaIndex provides tools for ingesting, processing, and implementing complex query workflows that combine data access with LLM prompting.

Ukeje Goodness
Jul 23, 2024 ⋅ 5 min read
JavaScript logo on top of violet background

Exploring essential DOM methods for frontend development

Learn four groups of DOM methods and their uses to create responsive and dynamic webpages. A helpful DOM reference table is also included.

Chimezie Innocent
Jul 23, 2024 ⋅ 12 min read
Playwright Adoption Guide: Overview, Examples, And Alternatives

Playwright adoption guide: Overview, examples, and alternatives

Playwright has become one of the leading technologies for writing end-to-end tests for modern web apps thanks to its rich and intuitive API.

Antonello Zanini
Jul 22, 2024 ⋅ 15 min read
View all posts

6 Replies to "Cleaning up your Vue.js code with ES6+"

  1. Great tips, one question, when I use the arrow functions I get undefined on this… Any suggestion?

    1. Hi, Maximiliano, thanks for reading!

      So, if “this” is returning “undefined”, you’re probably using arrow functions in the wrong place. You shouldn’t use them when defining a function for your data, or lifecycle methods, as you do want this to be bound to the context. So doing { mounted: () => { console.log(this.hello) } } will console log undefined (rightly).

      You should use arrow functions _within_ your methods, lifecylcles, etc. so that the context of “this” will always be your component.

      For more information on arrow functions, check out this article: https://codeburst.io/javascript-arrow-functions-for-beginners-926947fc0cdc

  2. (hello = 0) Destructuring works let { hello } = this and then I hello = 1 in the method and the value changes if I assign it to a different value but when a different method later calls the data() for that particular data it is as-if it was never changed at all because when I check it again it is still hello = 0.

    1. Hi, Lou!

      So the reason mutating the value of “hello” doesn’t work, is that primitive values (like a number or string) are copied by value, not reference. When you do let { hello } = this, what it’s really doing is let hello = this.hello, which *copies* the value of this.hello into a new local variable. So when you mutate your local variable, it won’t change the value of this.hello.

      For more information, check out this AWESOME article on value vs reference in JS: https://codeburst.io/explaining-value-vs-reference-in-javascript-647a975e12a0

Leave a Reply