It was discovered (tested in Chrome) that the index of an array can actually be an array itself:
a = [1, 2, 3]
index = [1]
a[index] // returns 2
Has there been any official documentation confirming this behavior?
It was discovered (tested in Chrome) that the index of an array can actually be an array itself:
a = [1, 2, 3]
index = [1]
a[index] // returns 2
Has there been any official documentation confirming this behavior?
Has there been any official documentation confirming this particular behavior?
12.3.2.1Runtime Semantics: Evaluationlays out the following three steps
3 Determine propertyNameReference by evaluating Expression.
4 Determine propertyNameValue as ? GetValue(propertyNameReference).
6 Determine propertyKey as ? ToPropertyKey(propertyNameValue).
Further clarification on 7.1.14ToPropertyKey ( argument ) can be found here
key as ? ToPrimitive(argument, hint String)Type(key) is Symbol, thenkey.ToString(key).This essentially means that unless the expression results in a Symbol, the key will be converted to a string.
When @Ryan and @4castle brought up the point, it was mentioned that in JavaScript, key (found within brackets []) gets converted to a string using [].join(',').
Feel free to test it out using this code snippet.
var xyz = {
"1,2": "eee"
};
console.log(xyz[[3,4]]);In JavaScript, when using a[index]</, it will perform a toString operation on the index value. If the index is an array, its toString method will be invoked as index.join(), resulting in the output being a['1'].
For more information on property accessors in JavaScript, you can visit: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors
My component is called DropdownLanguage.vue Goal: I need to show the current active language by default in the :text="selectedOptionDropdown" attribute. For example, it should display "English" which corresponds to languages.name. I'm struggling with ...
Hey everyone! I'm new to this forum and have recently made the switch from jQuery to Vue.js - what a game-changer! However, I've hit a little snag. I need to set v-loading on multiple buttons in a loop and have it start showing when clicked. Her ...
Assume I have a unique requirement to trigger a function within a custom element. The goal is to update text in the element only when a slider is moved within that specific element. Here's an example implementation in the main.js file: class Oninput ...
Currently learning NextJS and delving into the API. Within the api folder, there is a default hello.js file containing an export default function that outputs a JSON response. If I decide to include another route, do I need to create a new file for it or ...
After encountering countless "WCF" questions online, I am starting to believe that finding a solution is nearly impossible. Can someone prove me wrong? My current situation involves working with a Self Hosted WCF Service where endpoints are defined progra ...
I am attempting to disable the select list after unchecking the checkbox and resetting the select value back to default, but currently it is retaining the last selected option. I am utilizing React-select for the select and options in this scenario. APP.j ...
I recently downloaded the jQuery Chosen plugin to use the simple "multiselect" version on my website. I followed all the necessary steps and even copied and pasted the code into CodeIgniter. Despite my experience with jQuery, I am facing an issue where the ...
Welcome to the HomesScreen.js! This section handles rendering the flat list elements. import { StatusBar } from 'expo-status-bar'; import { Button, Image, Modal, StyleSheet, Text, TouchableOpacity, View } from 'react-native'; import { ...
My response to a question about closures on SO included the following code sample: function Constructor() { var privateProperty = 'private'; var privateMethod = function(){ alert('called from public method'); }; ...
I've recently started experimenting with Anime.js. I have a piece of code that I'm using to animate a div element with an id of a. anime({ targets: "#a", translateX: 250, color: "#fff", backgroundColor: "hsl(200, 50%, 50%)", ...
Looking to implement the PrimeNG Table. https://i.stack.imgur.com/bQycr.png Check out the live demo on StackBlitz. The table has three editable columns. The "Property Name" column always displays a text box in edit mode, while the "Property Value Type" ...
Can someone please help me with a JavaScript code to close the current window? I have tried the following code but it does not seem to work: <input type="button" class="btn btn-success" style="font-weight: b ...
I have a JavaScript code snippet that needs to be inserted after the "Artwork" section. Here is the code: <div class="image-upload"> <label for="files"> <img src="ohtupload.jpg"> </label> </di ...
Hello, I’ve been experimenting with using a web worker to retrieve data and send it back to the main thread. However, I've encountered an issue with my code not working as expected. onmessage = (e) => { console.log(e); if( e.data[0] === &apos ...
Is there a way to dynamically get the width of the browser as it is resized in real time? I have found a solution that provides the width, but it only updates when I refresh the page. How can I continuously update the value while resizing the browser? Thi ...
Is there a method to showcase a global map on my site and let the user select a country to receive relevant information? I am aware of embedding Google Maps, however, it includes unnecessary controls like zooming which I prefer not to inconvenience the us ...
tag: After downloading and installing a node_module (npm package)... I have customized the internal files within the node_modules folder to better fit my requirements. Although using it as a node_module is most convenient for me, I am concerned that futur ...
When I try to fetch data from an API and assign it to the VIEW BAG, I encounter an error during runtime. List<DevInfo> DevList = await RestApi.Instance.GetAllDevAsync(); var nameT = DevList.Select(a=>a.Name).ToList(); ViewBag.datasourceDevList = n ...
As I embark on creating my first Angular 2 app, I'm faced with the task of setting my template in an HTML file using `templateUrl`. Currently, both the component.ts and view.html are stored in the same folder under src/ directory. Here's what I ...
I have a scenario where data is being received by my confirm.php file. In this file, I have the following code and currently facing an issue with the javascript part. Any help and suggestions would be greatly appreciated. The objective of my javascript is ...