Tips for managing a list of strings with a maximum length: Automatically remove the first string from the list when a new one

Question

Tips for managing a list of strings with a maximum length: Automatically remove the first string from the list when a new one

I am looking for a way to keep track of a list of strings with a maximum length.

For instance, I need to maintain a list with a maximum length of 3. I want to add new items to the list as long as its length is less than 3. However, once the length reaches 3 and I try to add a new item, I want to remove the oldest entry from the list.

const list = ["A", "B", "C"]
list.push("D")
// Your logic here

// The expected output should be ["B", "C", "D"]
console.log(list)

Does anyone have any suggestions on how to accomplish this?

javascript angular typescript list

Answer 1

Answer №1

shift removes the first element and then push adds a new element.

let myList = ['X', 'Y', 'Z'];
myList.length < 3 ? myList.push('W'): updateArray(myList);

function updateArray(myList){
 mylist.shift();
 mylist.push('W');
}
console.log(myList);

Answer 2

shift removes the first element and then push adds a new element.

let myList = ['X', 'Y', 'Z'];
myList.length < 3 ? myList.push('W'): updateArray(myList);

function updateArray(myList){
 mylist.shift();
 mylist.push('W');
}
console.log(myList);

Answer 3

Answer №2

To establish a rule for the maximum length, you can utilize a class:

class MaxLengthArray {

    private _array: string[];

    get array() {
        return this._array;
    }

    constructor() {
        this._array = [];
    }

    public insert(newValue: string) {
        if (this.array.length >= 3) {
            this.array.push(newValue);
            this.array.shift();
        } else {
            this.array.push(newValue);
        }
    }

}

Explore more on TypeScript here!

Answer 4

To establish a rule for the maximum length, you can utilize a class:

class MaxLengthArray {

    private _array: string[];

    get array() {
        return this._array;
    }

    constructor() {
        this._array = [];
    }

    public insert(newValue: string) {
        if (this.array.length >= 3) {
            this.array.push(newValue);
            this.array.shift();
        } else {
            this.array.push(newValue);
        }
    }

}

Explore more on TypeScript here!

Answer 5

Answer №3

What we require is a Queue (slightly modified), a first in first out (FIFO) data structure.

class Queue<T> {
  _store: T[] = [];
  push(val: T) {
    if (this._store.length < 3) {
      this._store.push(val);
    } else {
      this._store.shift();
      this._store.push(val);
    }
  }

  GetQ() {
    return this._store;
  }

}

NOTE: The above class encapsulates the Queue. You may need to customize it according to your requirements.

Answer 6

What we require is a Queue (slightly modified), a first in first out (FIFO) data structure.

class Queue<T> {
  _store: T[] = [];
  push(val: T) {
    if (this._store.length < 3) {
      this._store.push(val);
    } else {
      this._store.shift();
      this._store.push(val);
    }
  }

  GetQ() {
    return this._store;
  }

}

NOTE: The above class encapsulates the Queue. You may need to customize it according to your requirements.

Tips for managing a list of strings with a maximum length: Automatically remove the first string from the list when a new one

Answer №1

Answer №2

Answer №3

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