How can I prevent all code paths from causing errors in Typescript with Vuex?

Question

How can I prevent all code paths from causing errors in Typescript with Vuex?

It is possible that I may have overlooked specifying the return type in this function. However, I am unsure of how to adjust it. Please help me preserve the original function while migrating it to TypeScript. Your assistance and insights are greatly appreciated :)

const arrayPromise: Promise<string[]> = new Promise<string[]>((resolve, reject) => {
                // Requesting elements: depAirportId, arrAirportId, depPlandTime // Choose a specific airline using &airlineId=AAR
                axios.get(url)
                    .then((res:any) => {
                        // ! Not all code paths return a value.ts(7030)
                        const item = res.data.response.body.items.item
                        this.state.totalCount = res.data.response.body.totalCount
                        if(this.state.totalCount < 1)
                        return this.state.noTicket

                        this.state.depTime = res.data.response.body.items.item.forEach((obj:any) => {
                            /* Using interpolation allows for function usage (as no interference with object properties) */
                            obj.depTime = `${obj.depPlandTime}`.slice(-4, -2)
                            /* Object.values: converts each object into an array */
                            return Object.values(obj)
                        })
                        this.state.depMin = res.data.response.body.items.item.forEach((obj:any) => {
                            obj.depMin = `${obj.depPlandTime}`.slice(-2)
                            return Object.values(obj)
                        })
                        this.state.arrTime = res.data.response.body.items.item.forEach((obj:any) => {
                            obj.arrTime = `${obj.arrPlandTime}`.slice(-4, -2)
                            return Object.values(obj)
                        })
                        this.state.arrMin = res.data.response.body.items.item.forEach((obj:any) => {
                            obj.arrMin = `${obj.arrPlandTime}`.slice(-2)
                            return Object.values(obj)
                        })

typescript vuex typescript-typings

Answer 1

Answer №1

It's uncertain if this code will make sense to you, as there wasn't much information provided about the returned JSON. It was challenging to understand your requirements clearly. However, I believe these modifications should be helpful.

Take a look at the comments explaining the changes I made... Your code seemed unclear to me, especially regarding the return value of string[]. I have adjusted it to return the items obtained from the call. If you specifically need a string[], please specify what should be included in that array.

class YourClass {

state: any;

// incorporating async functions in TypeScript
async arrayPromise(): Promise<any[]> { 
    try {
        const result: any[] = [];

        // mentioning the elements required: depAirportId, arrAirportId, depPlandTime // selecting a specific airline: &airlineId=AAR
        // ! URL was undefined
        const url = 'https://';
        // making the request and awaiting the response (avoiding callback hell with .this())
        const res =  await axios.get(url);

        // ! Do you really need to modify this.state within this function?
        this.state.totalCount = res.data.totalCount;

        if (this.state.totalCount < 1) { 
            return result;
        }

        for (let obj of res.data.items) { 
            // parsing data and enhancing the object
            obj.depTime = `${obj.depPlandTime}`.slice(-4, -2);
            obj.depMin = `${obj.depPlandTime}`.slice(-2);
            obj.arrTime = `${obj.arrPlandTime}`.slice(-4, -2);
            obj.arrMin = `${obj.arrPlandTime}`.slice(-2);

            // adding the object to the result array
            result.push(obj.depTime);
        })

        // returning the result
        return result;
    } catch (error: any) {
        console.error('An error occurred', error);
        throw error;
        // alternatively, `return [];` if error handling is not needed in the calling method
    }
}

}

Answer 2

It's uncertain if this code will make sense to you, as there wasn't much information provided about the returned JSON. It was challenging to understand your requirements clearly. However, I believe these modifications should be helpful.

Take a look at the comments explaining the changes I made... Your code seemed unclear to me, especially regarding the return value of string[]. I have adjusted it to return the items obtained from the call. If you specifically need a string[], please specify what should be included in that array.

class YourClass {

state: any;

// incorporating async functions in TypeScript
async arrayPromise(): Promise<any[]> { 
    try {
        const result: any[] = [];

        // mentioning the elements required: depAirportId, arrAirportId, depPlandTime // selecting a specific airline: &airlineId=AAR
        // ! URL was undefined
        const url = 'https://';
        // making the request and awaiting the response (avoiding callback hell with .this())
        const res =  await axios.get(url);

        // ! Do you really need to modify this.state within this function?
        this.state.totalCount = res.data.totalCount;

        if (this.state.totalCount < 1) { 
            return result;
        }

        for (let obj of res.data.items) { 
            // parsing data and enhancing the object
            obj.depTime = `${obj.depPlandTime}`.slice(-4, -2);
            obj.depMin = `${obj.depPlandTime}`.slice(-2);
            obj.arrTime = `${obj.arrPlandTime}`.slice(-4, -2);
            obj.arrMin = `${obj.arrPlandTime}`.slice(-2);

            // adding the object to the result array
            result.push(obj.depTime);
        })

        // returning the result
        return result;
    } catch (error: any) {
        console.error('An error occurred', error);
        throw error;
        // alternatively, `return [];` if error handling is not needed in the calling method
    }
}

}

How can I prevent all code paths from causing errors in Typescript with Vuex?

Answer №1

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