ECMAScript 2021 (ES12)
One of the most anticipated features in ES12 is the addition of the
replaceAll method to the
String prototype. The
replaceAll method makes it easier to replace all occurrences of a substring in a string with another substring. Before ES12, developers had to use regular expressions with the global flag to replace all occurrences of a substring. But, with
replaceAll, it's now easier and more readable to perform global string replacements.
const myString = 'Hello, World!'; const replacedString = myString.replaceAll('o', '0'); console.log(replacedString); // "Hell0, W0rld!"
2. Numeric Separators
Another exciting feature in ES12 is the addition of numeric separators. Numeric separators allow developers to separate long numbers with underscores for readability purposes. Numeric separators can be used in decimal, binary, octal, and hexadecimal literals.
const million = 1_000_000; const binaryNumber = 0b1010_0000; const octalNumber = 0o17_777; const hexadecimalNumber = 0x1F_F0;
Numeric separators make it easier to read and understand big numbers, especially when dealing with mathematical operations or binary/hexadecimal numbers.
3. Logical Assignment Operators
ES12 introduces three new logical assignment operators:
??=. These operators combine logical operators and assignment operators and allow developers to write more concise and readable code.
let a = true; let b = false; let c = null; a &&= b; // a = false b ||= c; // b = null c ??= 10; // c = 10
Other ES12 Features
ES12 also includes other features such as Promise.any, WeakRef, Finalizers, AggregateError, and more. While these features may not be as popular as the ones mentioned above, they still bring significant improvements to the language and its ecosystem.
Type Safety: TypeScript's static type checking helps catch errors early and makes it easier to refactor code without introducing bugs.
Code Readability: TypeScript code is more readable and self-documenting, thanks to its use of types, interfaces, and classes.
Better Tooling Support: TypeScript integrates well with popular code editors and development tools, which provides better autocompletion, error highlighting, and documentation.
Safer Refactoring: TypeScript makes it easier to refactor code without breaking things, thanks to its safety checks and code analysis.
TypeScript's future looks bright, and the TypeScript team has many plans for improving the language and its ecosystem. Some of the upcoming features and improvements include:
Exact Types: Exact types allow developers to specify precisely what properties an object should have and what their types should be. This feature will improve code safety and make it easier to catch errors and enforce rules.
Decorators: Decorators are a language feature that allows developers to modify the behavior of classes and functions at runtime. Decorators are a popular feature in many programming languages, and TypeScript plans to bring them to the language.
Partial Type Inference: Partial type inference allows TypeScript to infer types based on partial input, which will reduce the need for explicit type annotations and make code more concise.
Language Agnosticism: WebAssembly can be compiled from any programming language, which provides more flexibility and allows developers to choose the best language for their project.
WebAssembly is still relatively new, but it's already making a significant impact on the web development ecosystem. Some of the upcoming features and improvements that we can expect from WebAssembly include:
Garbage Collection: Garbage collection is a feature that automatically frees memory that is no longer needed by the program. WebAssembly is working on adding garbage collection to the language, which will make it easier to write memory-safe and predictable code.
Threading: WebAssembly is working on adding support for threads, which will allow developers to write multi-threaded code and take advantage of modern CPUs that have multiple cores.
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