![]() ![]() Using fineProperty(), we can attach accessors to an object that (mostly) recreate our negative array indexing access. It added support for getters and setters which allow you to define methods that control how specific properties are accessed. You could have almost, sort of, kind of accomplished this using old-fashioned JavaScript.Īnd by “old-fashioned,” I mean specifically ECMAScript 5.1 which was released in 2011. To implement it, you need to get creative. ![]() JavaScript unfortunately doesn’t support this syntax natively. createSlice A function that accepts an initial state, an object of reducer functions, and a 'slice name', and automatically generates action creators and action types that correspond to the reducers and state. If omitted, slice extracts to the end of the string. Union types allow a variable or parameter to have more than one type. endSlice The zero-based index at which to end extraction. TypeScript offers advanced type features like union types, intersection types, and mapped types, which allow developers to create more expressive and powerful type definitions. Syntax string.slice ( beginslice, endSlice ) Argument Details beginSlice The zero-based index at which to begin extraction. Say that you were tired of writing array all of the time, and that you wanted to be able to simply write array instead. This method extracts a section of a string and returns a new string. That’s pretty abstract, so let’s take a look at a concrete example. In a nutshell, proxies allow you to wrap objects in order to intercept and modify the behavior of certain actions–stuff like accessing properties and making function calls. They give you a level of flexibility that simply didn’t exist previously in JavaScript, and have allowed for projects like Remote Browser to become possible. That’s a real shame because proxies are pretty awesome. They were introduced by ECMAScript 2015 (ES6) several years ago, but they remain one of the less well-known features of the language. I’ve noticed that JavaScript proxies seem to have been getting an increasing amount of attention recently. ![]()
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