Article directory
Introduction
JavaScript ES12 (also known as ECMAScript 2022) is the latest version of JavaScript, which introduces several new features and language capabilities to provide a better development experience and more powerful programming capabilities
Promise.any()
This method takes an iterable object, returns a new Promise, and resolves the promise when any promise in the iterable object is resolved. It can be used to handle multiple asynchronous operations, just waiting for one of them to succeed.
WeakRef 和 FinalizationRegistry
WeakRef allows you to hold a weak reference to an object without affecting garbage collection, while FinalizationRegistry allows you to register objects to perform cleanup operations before they are garbage collected. This is useful for dealing with some resource management or caching scenarios.
number separator
ES12 allows the use of underscores as separators in numbers to improve the readability of numbers, for example: 1_000_000.
String.prototype.replaceAll()
This method replaces all matching substrings in the string, unlike String.prototype.replace(), it replaces all occurrences of the match, not just the first match.
Logical Assignment Operators
Logical assignment operators, such as ||=, &&=, ??=, etc. are introduced to simplify the logical judgment and operation of variable assignment.
New Methods for Numeric Types
ES12 adds some new methods of number types, such as Number.isNaN(), Number.isFinite(), Number.parseInt(), etc., to provide more convenient number processing capabilities.
private fields and methods
By using the private fields and methods defined by the # symbol in the class, it can be restricted to access within the class and prevent external access and modification.
#These are some important new features in ES12, which provide more functions and syntactic sugar, enabling developers to write modern JavaScript code more efficiently. However, it should be noted that different browsers and JavaScript operating environments may have different support for ES12. Please perform a compatibility test on the target platform or use tools such as Babel to translate to ensure the stable operation of the code.