What is the method for selecting specific indices and then matching them to different indices?

Question

What is the method for selecting specific indices and then matching them to different indices?

There is a need to execute an API call with specific parameters.

Here is an example:

const apiFunc = (someId, anotherId) => apiCall(someId, anotherId)

However, when the data is stored in an array named someArr, it appears like this:

[1, 'someId', 2, 'anotherId', 3, 'anotherId', 4, 'someId']

The goal is to utilize values in the function apiCall() based on certain conditions. For instance, if 1 (same as 4) is followed by 'someId', then use it, and if 2 (same as 3) is followed by 'anotherId', then use it.

Could you please suggest how to properly structure this to achieve the desired outcome?

Thank you.

I have attempted using .includes() method but it hasn't been very successful.

javascript arrays typescript object ecmascript-6

Answer 1

Answer №1

To efficiently retrieve values before "someId" and "anotherId", you can utilize the `filter` method in JavaScript. Extract the values preceding each identifier and then pair them for API calls:

// Example to demonstrate
const apiCall = (someId, anotherId) => console.log(someId, anotherId);

const arr = [1, 'someId', 2, 'anotherId', 3, 'anotherId', 4, 'someId'];

// Retrieve all values before "someId"
const someIdValues = arr.filter((val, i) => arr[i+1] === "someId");
// Retrieve all values before "anotherId"
const anotherIdValues = arr.filter((val, i) => arr[i+1] === "anotherId");

// Pair and make API calls
for (let i = 0; i < someIdValues.length; i++) {
    apiCall(someIdValues[i], anotherIdValues[i]);
}

Answer 2

To efficiently retrieve values before "someId" and "anotherId", you can utilize the `filter` method in JavaScript. Extract the values preceding each identifier and then pair them for API calls:

// Example to demonstrate
const apiCall = (someId, anotherId) => console.log(someId, anotherId);

const arr = [1, 'someId', 2, 'anotherId', 3, 'anotherId', 4, 'someId'];

// Retrieve all values before "someId"
const someIdValues = arr.filter((val, i) => arr[i+1] === "someId");
// Retrieve all values before "anotherId"
const anotherIdValues = arr.filter((val, i) => arr[i+1] === "anotherId");

// Pair and make API calls
for (let i = 0; i < someIdValues.length; i++) {
    apiCall(someIdValues[i], anotherIdValues[i]);
}

Answer 3

Answer №2

To implement a basic function, consider the following approach:

const findNextId = (arr, num): string | null => {
  const index = arr.indexOf(num);

  if (index === -1 || index === arr.length - 1) {
    return null;
  }

  return arr[index + 1];
};

You can then apply it as follows:

const nextId1 = findNextId(someArray, 1);  // 'someIdentifier'
const nextId2 = findNextId(someArray, 3);  // 'anotherIdentifier'

executeApiCall(nextId1, nextId2);

Answer 4

To implement a basic function, consider the following approach:

const findNextId = (arr, num): string | null => {
  const index = arr.indexOf(num);

  if (index === -1 || index === arr.length - 1) {
    return null;
  }

  return arr[index + 1];
};

You can then apply it as follows:

const nextId1 = findNextId(someArray, 1);  // 'someIdentifier'
const nextId2 = findNextId(someArray, 3);  // 'anotherIdentifier'

executeApiCall(nextId1, nextId2);

What is the method for selecting specific indices and then matching them to different indices?

Answer №1

Answer №2

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