Check if second array has any string from first array

Question

I am trying to find if second array has any string from the first one. Not sure what I am doing wrong

const domainAlertList = ["@domain1", "@tomato2", "@carrot3"];

const search = ["test@domain1.com", "test@tomato2.com"];

const myFunc = () => {
  return search.some((r) => domainAlertList.includes(r));
};

console.log(myFunc());

It returns false instead of true

[this could help](https://stackoverflow.com/questions/16312528/check-if-an-array-contains-any-element-of-another-array-in-javascript). It is basically the same question you asked. — Zirix, Mar 05 '22 at 10:36
You need to change the test; `test@domain1.com` includes `@domain1`, not the other way around. — , Mar 05 '22 at 10:37
You need to understand why your code doesn't work. Array.includes looks for an element that matches. But the domain is just a part of the email. String.includes on the other hand looks for a partial match. However your code does it, it needs to compare every email against every domain. Your code doesn't do that. — , Mar 05 '22 at 10:45

score 2 · Accepted Answer · answered Mar 05 '22 at 10:42

const domainAlertList = ["@domain1", "@tomato2", "@carrot3"];

const search = ["test@domain1.com", "test@tomato2.com"];

const myFunc = () => {
  return domainAlertList.some((r) => {
      return search.some(t => t.includes(r))
  });
};

console.log(myFunc());

score 1 · Answer 2 · answered Mar 05 '22 at 10:41

1

There are many ways to approach this. One of them could be the indexOf() method.

let str = "test@domain1.com";

str.indexOf('domain1') !== -1 // true

source

answered Mar 05 '22 at 10:41

Zirix

11
1

score 0 · Answer 3 · answered Mar 05 '22 at 10:41

You have to map through the second array too like this

const domainAlertList = ["@domain1", "@tomato2", "@carrot3"];

const search = ["test@domain1.com", "test@tomato2.com"];

const myFunc = () => {
  return search.some((r) => domainAlertList.some(domain=>{domain.includes(r)});
};

console.log(myFunc());

score 0 · Answer 4 · answered Mar 05 '22 at 10:49

You can iterate and use array filter function.

const domainAlertList = ["@domain1", "@tomato2", "@carrot3"];
const search = ["test@domain1.com", "test@tomato2.com"];

let r = []
domainAlertList.forEach(i => {
  r.push( search.filter(i1 =>  i1.includes(i)) )  
})
newArr = r.map((a) => {
  if(a.length != 0) {
    return a
  }
}).filter((a) => a);
console.log(newArr)

score 0 · Answer 5 · answered Mar 05 '22 at 10:51

const domainAlertList = ["@domain1", "@domain1", "@carrot3"];

const search = ["test@domain1.com", "test@domain1.com"];

const myFunc = () => {
  return domainAlertList.some((domain) =>
    search.some((email) => email.includes(domain))
  );
};

console.log(myFunc());

Check if second array has any string from first array

5 Answers5