I am trying to use cluster to exploit the benefit of having multi-core CPUs. With code: node worked perfectly with output However, when I tried to use import together with babel, I got problems: the output (after babel) of node is: This looks weird. I am using node v6.4.0, with babel 6.11.4 (babel-core 6.13.2…
Tag: ecmascript-6
Filter object properties by key in ES6
Let’s say I have an object: I want to create another object by filtering the object above so I have something like. I am looking for a clean way to accomplish this using Es6, so spread operators are available to me. Answer If you have a list of allowed values, you can easily retain them in an object usi…
How to initialise array in react-native using es6?
I am trying to create empty array in react-native using es6. But while accessing it I get an error data not defined. Here is the code snippet which I am using to initialise the array. Here is the code through which I am trying to populate the array and at the same time logging it I think so there is
How to transform an object into an array of objects?
I am looking for a way to transform an object into an array of objects, and remove the first unique key. How can I make this: into this: so I can .map through it like this: Answer You can use Object.keys() to get array of keys and then map() to change keys to values or in this case objects.
How to add disabled attribute via prop to a button in react?
I am creating a custom button component in react. I want to pass a prop to that button, based on the value of which button gets enabled or disabled. My problem is – The mere presence of the disabled property disables the element, so I cannot set its value as “false”. Even the following code …
Can there be generator getters in classes?
I mean getters that are generators. All this is ES6+ I believe. Like this maybe. That doesn’t work through, I am placing the asterisk wrong (that is if this is possible at all) unexpected identifier * Answer There is no shorthand notation for this. You can however return a generator from a getter proper…
Terse way to intersperse element between all elements in JavaScript array?
Say I have an array var arr = [1, 2, 3], and I want to separate each element by an element eg. var sep = “&”, so the output is [1, “&”, 2, “&”, 3]. Another way to think about it is I want to do Array.prototype.join (arr.join(sep)) without the result being a stri…
How can I conditionally import an ES6 module?
I need to do something like: The above code does not compile; it throws SyntaxError: … ‘import’ and ‘export’ may only appear at the top level. I tried using System.import as shown here, but I don’t know where System comes from. Is it an ES6 proposal that didn’t end up…
Import not working with JavaScript in PhpStorm/Webstorm
I’m trying to run a piece of JavaScript code written in a tutorial that looks like this: main.js However, PhpStorm is giving the following error: Import declarations are not supported by current JavaScript version How I can get a newer(?) JavaScript version in PhpStorm? Is that really the problem here? …
forEach is not a function error with JavaScript array
I’m trying to make a simple loop: But I get the following error: VM384:53 Uncaught TypeError: parent.children.forEach is not a function Even though parent.children logs: What could be the problem? Note: Here’s a JSFiddle. Answer First option: invoke forEach indirectly The parent.children is an Arr…