Utilize the findIndex method to search for an element starting at a designated index

Question

Utilize the findIndex method to search for an element starting at a designated index

Below is a snippet of code that I have:

private getNextFakeLinePosition(startPosition: number): number{
        return this.models.findIndex(m => m.fakeObject);
}

This function is designed to return the index of the first element in the array that has the property fakeObject set to true.

What I am seeking is similar functionality, but instead of searching through the entire array, I want to specify a starting position (startPosition).

Please note that although this code is written in TypeScript, a solution using plain JavaScript would also be acceptable.

javascript typescript

Answer 1

Answer №1

To make use of the findIndex() callback effectively, you can include a condition based on the current index like this:

private determineNextPositionFromStart(startPosition: number): number {
    return this.models.findIndex((m, i) => i >= startPosition && m.fakeObject);
}

This approach might not be the most optimal in terms of efficiency, but it should work fine for smaller arrays.

Answer 2

To make use of the findIndex() callback effectively, you can include a condition based on the current index like this:

private determineNextPositionFromStart(startPosition: number): number {
    return this.models.findIndex((m, i) => i >= startPosition && m.fakeObject);
}

This approach might not be the most optimal in terms of efficiency, but it should work fine for smaller arrays.

Answer 3

Answer №2

If you want to locate a specific item in an array starting from a certain position, you can utilize the slice method:

private findRealIndex(startPosition: number): number {
  const subArray = this.arrayToSearch.slice(startPosition);
  const index = subArray.findIndex(item => item.includes('desiredValue'));
  return index === -1 ? -1 : index + startPosition;
}

This approach involves slicing the input array to create a subarray and then finding the index within that subarray. Finally, by adding the initial startPosition, you get the actual index of the desired item.

Answer 4

If you want to locate a specific item in an array starting from a certain position, you can utilize the slice method:

private findRealIndex(startPosition: number): number {
  const subArray = this.arrayToSearch.slice(startPosition);
  const index = subArray.findIndex(item => item.includes('desiredValue'));
  return index === -1 ? -1 : index + startPosition;
}

This approach involves slicing the input array to create a subarray and then finding the index within that subarray. Finally, by adding the initial startPosition, you get the actual index of the desired item.

Answer 5

Answer №3

If I were faced with this scenario, my choice would likely be to implement a for loop. This approach eliminates the need to slice the array and also avoids unnecessary index checks.

const findStartFromPosition = <T>(condition: (element: T) => boolean, arr: T[], startPos: number): number => {
  for (let j = startPos; j < arr.length; j++) {
    if (condition(arr[j])) {
      return j;
    }
  }

  return -1;
};

Answer 6

If I were faced with this scenario, my choice would likely be to implement a for loop. This approach eliminates the need to slice the array and also avoids unnecessary index checks.

const findStartFromPosition = <T>(condition: (element: T) => boolean, arr: T[], startPos: number): number => {
  for (let j = startPos; j < arr.length; j++) {
    if (condition(arr[j])) {
      return j;
    }
  }

  return -1;
};

Answer 7

Answer №4

An effective approach is to iterate through the array until we encounter the desired start index:

let startIndex = 4;
array.findIndex((item, index) => index >= startIndex && item.fakeObject);

Answer 8

An effective approach is to iterate through the array until we encounter the desired start index:

let startIndex = 4;
array.findIndex((item, index) => index >= startIndex && item.fakeObject);

Utilize the findIndex method to search for an element starting at a designated index

Answer №1

Answer №2

Answer №3

Answer №4

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