This does not mean the value it holds is immutable—just that the variable identifier cannot be reassigned. For instance: const PI = 3.14; console.log(PI) //Prints 3.14 PI = 99; //TypeError: Assignment to constant variable. In the example above, the variable PI has been declared as a ...
How to understand as const? What does declare global mean? How to add a global variable to the TypeScript environment? Can interface be inherited? What does & mean in typescript? What is the difference between interface and type? What does enum mean as a type? What does the declare modul...
Another problem with using object literals (pre-ES6), is property/key orders are not guaranteed. Just because you have added the keys in a certain order, does not mean they will remain in that order, when you iterate through the keys. ...
What does "object destructuring" mean and what is the result of a destructuring operation?Say you have an object with some properties:const person = { firstName: 'Tom', lastName: 'Cruise', actor: true, age: 57 }You can extract just some of the object properties and put them into ...
ES6 has a new kind of string literal, the template literal:// String interpolation via template literals (in backticks) const first = 'Jane'; const last = 'Doe'; console.log(`Hello ${first} ${last}!`); // Hello Jane Doe! // Template literals also let you create strings with ...
See Allow captured let/const in loops Example See Example Improved checking for for..in statements See Improved checking for for..in statements Example See Example Modules are now emitted with a "use strict"; prologue See Modules are now emitted with a "use strict"; prologue Including .js fi...
const element = Hello World! As seen above, JSX differs significantly from both HTML and JavaScript; it uses its own format for content development. JSX is an extension of JavaScript with full compatibility with ECMAScript 2015’s syntax (ES6). JSX tags can...
Even more troubling, I discovered that my entire understanding of function names in JavaScript was completely wrong. After a few hours of existential thrashing (“What does it mean to have a name?”, “Am I a real boy?”, etc.), I decided to research the issue and learn the correct ...
We might notice that if we try to select a new color using the dropdown, the color does not update incolorComponent.vueand this is because by default the properties inprovideare not reactive. To Fix that, we make use ofcomputedmethod. ...
I am a long time user and proponent of coffeescript, much preferring the indentation-based/python-like syntax to native javascript. I've worked on some very large codebases that were written entirely in coffeescript with 50+ developers a...