Eliminating the nested API call within a loop

Question

Eliminating the nested API call within a loop

After making an API call to retrieve a set of data such as a list of users, I noticed that I am implementing a for loop and within it, I am making another API call to obtain each user's profile details based on their ID. I understand that this approach is not ideal and I am seeking advice on how I can refactor it more efficiently.

api.get(...).then(response => { 
   this.users = response; 
   for(let i=0; i<this.users.length; i++){
     api.get(...this.users[i].id).then(response => {
       if(response.name == this.users[i].name)
         this.newList.push(response);
     })
   }
})

Subsequently, in my HTML code, I iterate over this.newList to display the necessary information.

I am interested in finding a way to eliminate the nested API call from within the for loop while achieving the same desired outcome. How should I go about approaching this?

javascript typescript

Answer 1

Answer №1

One solution to consider is implementing async/await in your code. While it may not eliminate nested loops entirely, using async/await can greatly improve the readability of your code.

Here's an example:

async function fetchUsersAndProfiles () {
    try {
        this.users = await api.fetchData(...); 
        for(let i=0; i<this.users.length; i++){
            let response = await api.fetchData(...this.users[i].id);
            if (response.name == this.users[i].name)
                this.newList.push(response);
        }
    }
    catch (error) {
        console.log(error);
    }
}

You could also extract the API call for user profiles into a separate async function to enhance reusability and improve the overall structure of your code.

Answer 2

One solution to consider is implementing async/await in your code. While it may not eliminate nested loops entirely, using async/await can greatly improve the readability of your code.

Here's an example:

async function fetchUsersAndProfiles () {
    try {
        this.users = await api.fetchData(...); 
        for(let i=0; i<this.users.length; i++){
            let response = await api.fetchData(...this.users[i].id);
            if (response.name == this.users[i].name)
                this.newList.push(response);
        }
    }
    catch (error) {
        console.log(error);
    }
}

You could also extract the API call for user profiles into a separate async function to enhance reusability and improve the overall structure of your code.

Answer 3

Answer №2

To efficiently handle multiple requests, simply push each request into an array and utilize Promise.all() to execute them sequentially. Afterwards, generate a new list based on the results received.

 api.get(...).then(response => {
    this.users = response;
    const promises = this.users.map(user => api.get(...user.id))
    const result = Promise.all(promises).then(result => {
        this.newList = results.filter((user, i) => user.name === this.users[i].name)
    })
})

Answer 4

To efficiently handle multiple requests, simply push each request into an array and utilize Promise.all() to execute them sequentially. Afterwards, generate a new list based on the results received.

 api.get(...).then(response => {
    this.users = response;
    const promises = this.users.map(user => api.get(...user.id))
    const result = Promise.all(promises).then(result => {
        this.newList = results.filter((user, i) => user.name === this.users[i].name)
    })
})

Eliminating the nested API call within a loop

Answer №1

Answer №2

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