Throw and Catch

throw stops the current path, and catch handles the error in one place.

throw.ts

function divide(total: number, parts: number): number {
    if (parts === 0) {
        throw new Error("parts must not be zero");
    }
    return total / parts;
}

const parts: number = ;

try {
    const result: number = divide(20, parts);
    console.log(`result=${result}`);
} catch (error) {
    console.log("result=unavailable");
}

function divide(total: number, parts: number): number {
    if (parts === 0) {
        throw new Error("parts must not be zero");
    }
    return total / parts;
}

const parts: number = ;

try {
    const result: number = divide(20, parts);
    console.log(`result=${result}`);
} catch (error) {
    console.log("result=unavailable");
}

function divide(total: number, parts: number): number {
    if (parts === 0) {
        throw new Error("parts must not be zero");
    }
    return total / parts;
}

const parts: number = ;

try {
    const result: number = divide(20, parts);
    console.log(`result=${result}`);
} catch (error) {
    console.log("result=unavailable");
}

throw `throw` raises an error, and a nearby `try`/`catch` can recover with fallback behavior.