What is the best way to efficiently loop through elements and add them to a new array in JavaScript while optimizing performance?

Question

What is the best way to efficiently loop through elements and add them to a new array in JavaScript while optimizing performance?

Here's the code in question:

let newArr = []

const items = [
    {
        name: 'JTB 0110-01',
        offers: ['one', 'two']
    },
    {
        name: 'LOBA CHEMIE',
        offers: ['three', 'four', 'five']
    },
    //more
]

items.forEach(item => {
    item.offers.forEach(i => newArr.push(i));
})

//more code

My goal is to iterate over the items array and push each offers property to a new array.

While the code works, I want the iteration to be completed before moving on to the next section of code. How can I achieve this?

Update

Apologies for the confusion. I am looking for a way to make the iteration synchronous, so that the loop finishes before proceeding to the next part of the code.

javascript arrays object

Answer 1

Answer №1

If you're looking for a way to combine arrays in JavaScript, you can leverage the power of Array#concat along with the spread syntax ... and a mapped array.

var items = [{ name: 'JTB 0110-01', offers: ['one', 'two'] }, { name: 'LOBA CHEMIE', offers: ['three', 'four', 'five'] }],
    array = Array.prototype.concat(...items.map(({offers}) => offers));

console.log(array);

Answer 2

If you're looking for a way to combine arrays in JavaScript, you can leverage the power of Array#concat along with the spread syntax ... and a mapped array.

var items = [{ name: 'JTB 0110-01', offers: ['one', 'two'] }, { name: 'LOBA CHEMIE', offers: ['three', 'four', 'five'] }],
    array = Array.prototype.concat(...items.map(({offers}) => offers));

console.log(array);

Answer 3

Answer №2

To make your code more efficient, you can utilize the spread syntax along with the reduce method.

Using the reduce() method, you can apply a function to an accumulator and each element in the array, ultimately condensing them into a single value.

const items = [ { name: 'JTB 0110-01', offers: ['one', 'two'] }, { name: 'LOBA CHEMIE', offers: ['three', 'four', 'five'] }]
let result = items.reduce(function(acc,elem){
  acc.push(...elem.offers);
  return acc;
},[]);
console.log(result);

Answer 4

To make your code more efficient, you can utilize the spread syntax along with the reduce method.

Using the reduce() method, you can apply a function to an accumulator and each element in the array, ultimately condensing them into a single value.

const items = [ { name: 'JTB 0110-01', offers: ['one', 'two'] }, { name: 'LOBA CHEMIE', offers: ['three', 'four', 'five'] }]
let result = items.reduce(function(acc,elem){
  acc.push(...elem.offers);
  return acc;
},[]);
console.log(result);

Answer 5

Answer №3

To merge the values of the offer key, one can utilize the spread syntax.

let newArr = []

const items = [{
    name: 'JTB 0110-01',
    offers: ['one', 'two']
  },
  {
    name: 'LOBA CHEMIE',
    offers: ['three', 'four', 'five']
  }

]
var newArray = [];
items.forEach(function(item) {
  // // ... is spread syntax which will combine the array
   newArray.push(...item.offers)
})
console.log(newArray)

Answer 6

To merge the values of the offer key, one can utilize the spread syntax.

let newArr = []

const items = [{
    name: 'JTB 0110-01',
    offers: ['one', 'two']
  },
  {
    name: 'LOBA CHEMIE',
    offers: ['three', 'four', 'five']
  }

]
var newArray = [];
items.forEach(function(item) {
  // // ... is spread syntax which will combine the array
   newArray.push(...item.offers)
})
console.log(newArray)

What is the best way to efficiently loop through elements and add them to a new array in JavaScript while optimizing performance?

Update

Answer №1

Answer №2

Answer №3

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