Safe Assignment Operators: A New JavaScript Proposal to Say Goodbye to Try Catch!

Error handling has always been an important but complex issue in modern web development. conventional try-catch Although statements are powerful, they can easily lead to lengthy and difficult to maintain code.

To simplify this process,ECMAScriptA new proposal has recently been introduced:proposal-safe-assignment-operatorThe 'Safe Assignment Operator' is denoted as?=）。

Summary of Proposal

Secure assignment operator?=The goal is to simplify error handling.

It handles errors by converting the result of a function into an array.

• If the function throws an error, the operator returns[error, null]；
• If the function is successfully executed, return[null, result]。

This operator andPromise、asyncFunctions and any implementationSymbol.resultThe values of the method are compatible.

For example, when executingI/OOperation or based onPromiseDuring API interaction, unexpected errors may occur at runtime.

If these errors are ignored, it may lead to unexpected behavior and potential security vulnerabilities. Using secure assignment operators can effectively handle these errors:

const [error, response] ?= await fetch("https://blog.conardli.top");

Motivation for Proposal