Creating an array within a for loop in JavaScript: A step-by-step guide

Question

Creating an array within a for loop in JavaScript: A step-by-step guide

Coming from a Python background, I am embarking on the journey to learn basic concepts in JavaScript.

Currently, I have the following code snippet:

{
  name: 'Jobs ',
  path: '/plat/jobs',
  meta: {
    label: 'jobs',
    link: 'jobs/Basic.vue'
  },

My goal is to create this block for each element in a list using a for loop (including the curly brackets).

In Python, achieving this would look something like:

for i in items:
    {
      name: i.name,
      path: i.path,
      meta: {
        label: i.label,
        link: i.link
     }

How can I accomplish this in JavaScript? What exactly is the data type of this object? Is it simply a JavaScript dictionary?

  children: [
    let new_items = items.map(i => ({
      name: i.name,
      path: i.path,
      meta: {
        label: i.label,
        link: i.link
      }
    }));

    console.log(new_items);
      component: lazyLoading('android/Basic')
    }
  ]
}

I suspect that this approach won't work as I need each object listed under children individually.

javascript vue.js

Answer 1

Answer №1

Here is a demonstration of working with an array of objects to create a new array of objects. In JavaScript, an object can be compared to a hash, dictionary, or object in other programming languages.

let items = [{
  name: 'foo',
  path: 'foopath',
  label: 'foolabel',
  link: 'foolink'
}, {
  name: 'bar',
  path: 'barpath',
  label: 'barlabel',
  link: 'barlink'
}];

let new_items = items.map(i => ({
  name: i.name,
  path: i.path,
  meta: {
    label: i.label,
    link: i.link
  }
}));

console.log(new_items);

It's worth noting that there is no need for a new array as you can directly modify the existing object:

let items = [{
  name: 'foo',
  path: 'foopath',
  label: 'foolabel',
  link: 'foolink'
}, {
  name: 'bar',
  path: 'barpath',
  label: 'barlabel',
  link: 'barlink'
}];

items.forEach(i => {
  i.meta = {label:i.label, link:i.link};
  delete i.label;
  delete i.link;
});

console.log(items);

Answer 2

Here is a demonstration of working with an array of objects to create a new array of objects. In JavaScript, an object can be compared to a hash, dictionary, or object in other programming languages.

let items = [{
  name: 'foo',
  path: 'foopath',
  label: 'foolabel',
  link: 'foolink'
}, {
  name: 'bar',
  path: 'barpath',
  label: 'barlabel',
  link: 'barlink'
}];

let new_items = items.map(i => ({
  name: i.name,
  path: i.path,
  meta: {
    label: i.label,
    link: i.link
  }
}));

console.log(new_items);

It's worth noting that there is no need for a new array as you can directly modify the existing object:

let items = [{
  name: 'foo',
  path: 'foopath',
  label: 'foolabel',
  link: 'foolink'
}, {
  name: 'bar',
  path: 'barpath',
  label: 'barlabel',
  link: 'barlink'
}];

items.forEach(i => {
  i.meta = {label:i.label, link:i.link};
  delete i.label;
  delete i.link;
});

console.log(items);

Answer 3

Answer №2

If I were to transform a list of items, my go-to method would be using the list.map function.

items.map(item => {
    return {
        title: item.title,
        url: item.url,
        details: {
            description: item.description,
            link: item.link
        }
     }))

By utilizing this approach, a new list with the specified structure will be returned.

It's worth noting that further simplification can be achieved by using an implicit return:

items.map(item => ({
    title: item.title,
    url: item.url,
    details: {
        description: item.description,
        link: item.link
    }
}))

Answer 4

If I were to transform a list of items, my go-to method would be using the list.map function.

items.map(item => {
    return {
        title: item.title,
        url: item.url,
        details: {
            description: item.description,
            link: item.link
        }
     }))

By utilizing this approach, a new list with the specified structure will be returned.

It's worth noting that further simplification can be achieved by using an implicit return:

items.map(item => ({
    title: item.title,
    url: item.url,
    details: {
        description: item.description,
        link: item.link
    }
}))

Creating an array within a for loop in JavaScript: A step-by-step guide

Answer №1

Answer №2

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