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I am looking for an efficient way to remove items from a JavaScript array if they are present in another array. Using indexOf

byMR

May 6, 2022

I want to remove those items from arr_2 which contains the domain name from arr_1

let arr_1 = ["domain1.com", "domain2.com"];

let arr_2 = [
  "domain1.com/about-us",
  "domain3.com/contact-us",
  "domain4.com/privacy-policy",
  "domain2.com/pricing-plans",
  "sub.domain2.com/home-1",
];

let filtered_arr = [];

arr_2.forEach((item) => {
  if (item.indexOf(arr_1) == -1) {
    filtered_arr.push(item);
  }
});

console.log(filtered_arr);

i want the result ["domain3.com/contact-us", "domain4.com/privacy-policy"] from this code, but it prints the whole arr_2

>Solution :

you can achive it using filter some and includes

let arr_1 = ["domain1.com", "domain2.com"];

let arr_2 = [
  "domain1.com/about-us",
  "domain3.com/contact-us",
  "domain4.com/privacy-policy",
  "domain2.com/pricing-plans",
  "sub.domain2.com/home-1",
];

const arr3 = arr_2.filter(url => !arr_1.some(domain => url.includes(domain)))

console.log(arr3)