Importing JSON using ES modules was submitted as feature to TC39 in mid 2020, and is (at the time of this edit) in stage 3, which is the last stage before being accepted in to the spec (see https://github.com/tc39/proposal-json-modules for more details). Once landed, you will be able to use it as: Where someName is effectively the name of … Read more
Per the Redux FAQ question at here, this.props.dispatch is available by default if you do not supply your own mapDispatchToProps function. If you do supply a mapDispatchToProps function, you are responsible for returning a prop named dispatch yourself: Or, you can make sure your action creators are pre-bound using Redux’s bindActionCreators utility, and skip having to worry about using this.props.dispatch in your component.
Older versions of Babel came with everything out of the box. The newer version requires you install whichever plugins your setup needs. First, you’ll need to install the ES2015 preset. Next, you need to tell babelify to use the preset you installed. Source
I use classnames when there is a fair amount of logic required for deciding the classes to (not) use. An overly simple example: That said, if you don’t want to include a dependency then there are better answers below.
Class Names Firstly, if you’re certain that you’re extending from the correctly named class, e.g. React.Component, not React.component or React.createComponent, you may need to upgrade your React version. See answers below for more information on the classes to extend from. Upgrade React React has only supported ES6-style classes since version 0.13.0 (see their official blog post … Read more
https://facebook.github.io/react/docs/reusable-components.html#no-autobinding No Autobinding Methods follow the same semantics as regular ES6 classes, meaning that they don’t automatically bind this to the instance. You’ll have to explicitly use .bind(this) or arrow functions =>: You can use bind() to preserve this Or you can use arrow functions We recommend that you bind your event handlers in the constructor so they are … Read more
I tried solving below problem, passed 3 out of 4 conditions. I’m not able to find anymore errors in my code below. But still it says “failuresList should be an array containing result failure messages.” Link:https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals Problem:Use template literal syntax with backticks to create an array of list element (li) strings. Each list element’s text … Read more
React 16.8 +, Functional component Click here for a full demo on StackBlits React 16.3 +, Class component Class component – Ref callback Don’t use String refs. String refs harm performance, aren’t composable, and are on their way out (Aug 2018). string refs have some issues, are considered legacy, and are likely to be removed … Read more
Assuming you are using native Map‘s and it’s ok to use ES6, you can use the spread operator to expand Map.keys()
Edit: Several years have passed and this isn’t really the right way to do this any more (and probably never was, my bad). Mutating an imported module is nasty and can lead to side effects like tests that pass or fail depending on execution order. I’m leaving this answer in its original form for historical … Read more