Recover in TypeScript

// This function throws an error.
function mayThrow(): void {
    throw new Error("a problem");
}

// In TypeScript, we use try-catch blocks for error handling.
// There's no direct equivalent to Go's recover, but we can
// achieve similar functionality with try-catch.
function main() {
    try {
        mayThrow();
        // This code will not run if mayThrow() throws an error.
        console.log("After mayThrow()");
    } catch (error) {
        // This is similar to Go's recover. It catches the error
        // and allows the program to continue execution.
        console.log("Caught. Error:\n", error.message);
    }
}

main();

TypeScript, like JavaScript, uses a try-catch mechanism for error handling. While there’s no direct equivalent to Go’s recover function, we can achieve similar functionality using try-catch blocks.

In this example:

1. We define a mayThrow function that throws an error, similar to the mayPanic function in the original Go code.

2. In the main function, we wrap the potentially throwing code in a try block.

3. If an error is thrown, it’s caught in the catch block. This is analogous to Go’s deferred function with recover.

4. The error message is logged in the catch block, similar to how the recovered panic was handled in the Go version.

To run this TypeScript code, you would typically compile it to JavaScript and then run it with Node.js:

$ tsc error_handling.ts
$ node error_handling.js
Caught. Error:
 a problem

This demonstrates how TypeScript handles errors and allows for graceful recovery, preventing the entire program from crashing due to an uncaught exception.