What is the best way to find elements from an array in another array in js?

Question

I have a function buildList with an array of numbers in argument. I also have 11 elements which are numbers and i want to know if these elements exists in the array and if one element doesn't exist i push it in another array.

Actually it looks like that:

public static buildList(numbers[]) {
const newArray= [];
    if (numbers.find(element => element === ELEMENT_ONE) === undefined ) {
      newArray.push(ELEMENT_ONE);
    }
    if (numbers.find(element => element === ELEMENT_TWO) === undefined ) {
      newArray.push(ELEMENT_TWO);
    }
    ....
}

My current intuition was to create a new array with the 11 elements and do a for each but i'm not pretty sure the performance will be better... Is there any way to improve this code ? because i do the same things for the 11 elements

EugenSunic · Accepted Answer · 2020-03-09 09:18:28Z

2

function buildList(numbers) {
  let newArray = [];
  elevenElements = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

  // Use this logic to filter elements.
  newArray = elevenElements.filter(d => numbers.some(y => y === d))
  return newArray;
}

const result=buildList([1, 8, 9]);
console.log(result)

answered Mar 9, 2020 at 9:18

EugenSunic

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Comments

Jasdeep Singh · Accepted Answer · 2020-03-09 10:46:19Z

1

    public static buildList(numbers[]) {
      const newArray = [];
      elevenElements = [1,2,3,4,5,6,7,8,9,10,11]

// Use this logic to filter elements.
      newArray = elevenElements.filter(d => !numbers.includes(d))
    }

edited Mar 9, 2020 at 10:46

answered Mar 9, 2020 at 9:09

Jasdeep Singh

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2 Comments

ceving Over a year ago

Prints just an error: SyntaxError: unexpected token: 'static'. FF here.

Jasdeep Singh Over a year ago

@ceving I have just written the logic requested by the user.

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