Iterate through and remove elements within an array containing objects

Question

Iterate through and remove elements within an array containing objects

Within my Vue.js application, I am working with an array of objects that I need to iterate through and display in the web browser. The array consists of four objects, but I only wish to show three based on a user's preference setting stored in a variable (referred to as userPreference). I'm currently facing the challenge of efficiently removing one object from the array depending on the value of userPreference.

This is how I have implemented the v-for in my template:

<ul v-for="item in getOutroItems"><li>item<li></ul>

Here is my object structure:

data() {
return {
  outroItems: [{ title: "outro1", text: "XYZ" }, { title: "outro2", text: "ABC" }, { title: "outro3", 
               text`: "QRS" }, { title: "outro4", text: "TUV" }],
  userPreference: ""
};

}

This is my current computed property setup:

getOutroItems() { 
   this.outroItems.filter((value) => {
     if(this.userPreference === "newsletter") {
        /// Remove outro2 from the array here and return the remaining three values
     } else if(this.userPreference === "noNewsletter") {
        /// Eliminate outro3 from the array and return the rest of the values
     }
   })
}

I am seeking guidance on the most effective method for eliminating a specific element from an array. Any insights or clarifications would be greatly appreciated!

javascript arrays vue.js

Answer 1

Answer №1

To satisfy your requirement, you can use the following code with array.filter. This method only requires true or false in its return to determine whether to keep or remove an element from the array.

getOutroItems() { 
   this.outroItems.filter((value) => {
     if(this.userPreference === "newsletter") {
        // Remove outro2 and return an array with the other 3 values
      return value.title != 'outro2';
     } else if (this.userPreference === "noNewsletter") {
        // Remove outro3 and return an array with the other 3 values
    return value.title != 'outro3';
     }
   })
}

If you want to avoid creating another large array, you can swap the elements to be removed with the last indexed element in the array and then pop those elements from the array.

Answer 2

To satisfy your requirement, you can use the following code with array.filter. This method only requires true or false in its return to determine whether to keep or remove an element from the array.

getOutroItems() { 
   this.outroItems.filter((value) => {
     if(this.userPreference === "newsletter") {
        // Remove outro2 and return an array with the other 3 values
      return value.title != 'outro2';
     } else if (this.userPreference === "noNewsletter") {
        // Remove outro3 and return an array with the other 3 values
    return value.title != 'outro3';
     }
   })
}

If you want to avoid creating another large array, you can swap the elements to be removed with the last indexed element in the array and then pop those elements from the array.

Answer 3

Answer №2

There are various ways to extract the correct elements from an array.

The method I prefer and in this example: Utilizing array.filter

const outroItems = [
  { title: "outro1", text: "XYZ" },
  { title: "outro2", text: "ABC" },
  { title: "outro3", text: "QRS" },
  { title: "outro4", text: "TUV" }
];

const leftOverItems = outroItems.filter((item) => item.title !== "outro2");

console.log(leftOverItems);

Another approach is to identify the index of the item to be removed and then delete it using splice

const outroItems = [
  { title: "outro1", text: "XYZ" },
  { title: "outro2", text: "ABC" },
  { title: "outro3", text: "QRS" },
  { title: "outro4", text: "TUV" }
];

const itemToDelete = outroItems.find((item) => item.title === "outro2");
const indexToDelete = outroItems.indexOf(itemToDelete);

outroItems.splice(indexToDelete, 1);

console.log(outroItems);

By combining any of the aforementioned functions with a function, you can avoid duplicating code.

const itemToRemove = (arr, attr, name) => {
  return arr.filter((item) => item[attr] !== name);
}

const outroItems = [
  { title: "outro1", text: "XYZ" },
  { title: "outro2", text: "ABC" },
  { title: "outro3", text: "QRS" },
  { title: "outro4", text: "TUV" }
];

// Remove items from "outroItems" where "title" is "outro2"
const removed2 = itemToRemove(outroItems, "title", "outro2");
// Remove items from "outroItems" where "title" is "outro3"
const removed3 = itemToRemove(outroItems, "title", "outro3");
// Remove items from "outroItems" where "text" is "TUV"
const removedTUV = itemToRemove(outroItems, "text", "TUV");

console.log(removed2);
console.log(removed3);
console.log(removedTUV);

Answer 4

There are various ways to extract the correct elements from an array.

The method I prefer and in this example: Utilizing array.filter

const outroItems = [
  { title: "outro1", text: "XYZ" },
  { title: "outro2", text: "ABC" },
  { title: "outro3", text: "QRS" },
  { title: "outro4", text: "TUV" }
];

const leftOverItems = outroItems.filter((item) => item.title !== "outro2");

console.log(leftOverItems);

Another approach is to identify the index of the item to be removed and then delete it using splice

const outroItems = [
  { title: "outro1", text: "XYZ" },
  { title: "outro2", text: "ABC" },
  { title: "outro3", text: "QRS" },
  { title: "outro4", text: "TUV" }
];

const itemToDelete = outroItems.find((item) => item.title === "outro2");
const indexToDelete = outroItems.indexOf(itemToDelete);

outroItems.splice(indexToDelete, 1);

console.log(outroItems);

By combining any of the aforementioned functions with a function, you can avoid duplicating code.

const itemToRemove = (arr, attr, name) => {
  return arr.filter((item) => item[attr] !== name);
}

const outroItems = [
  { title: "outro1", text: "XYZ" },
  { title: "outro2", text: "ABC" },
  { title: "outro3", text: "QRS" },
  { title: "outro4", text: "TUV" }
];

// Remove items from "outroItems" where "title" is "outro2"
const removed2 = itemToRemove(outroItems, "title", "outro2");
// Remove items from "outroItems" where "title" is "outro3"
const removed3 = itemToRemove(outroItems, "title", "outro3");
// Remove items from "outroItems" where "text" is "TUV"
const removedTUV = itemToRemove(outroItems, "text", "TUV");

console.log(removed2);
console.log(removed3);
console.log(removedTUV);

Iterate through and remove elements within an array containing objects

Answer №1

Answer №2

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