How to check if any of the strings from an array with variable length are present in another string?

Question

I am trying to filter some data from an array in a JSON file, based on an input of the form string1, string1,string2, string1,string2,string3 etc., that is, some strings separated by a ,.

What I'm trying to do:

let arrInput = document.getElementById('inputBox').val.split(',');

for(let i = 0; i < arrToFilter.length; i++){
    if(.........what to write here?...........){
        arrOutput.push(arrToFilter[i]);
    }
}

return arrOutput;

If the arrInput had a fixed length, I could accomplish this using indexOf != -1 for each element in arrInput, but here, since the length of arrInput is variable, how can I check if at least one of the strings present in arrInput is also present as a substring in arrToFIlter[i]?

Edit:

Example:

Let arrToFilter be ["abcqwer", "pizza", "definition", "abcdef", "example"]

Case 1 :

Say the input entered (in an <input> element) is abc,def.

For this, the arrOutput should be ["abcqwer", "definition", "abcdef"]

Case 2:

Say the input entered is abc

Expected output : ["abcqwer", "abcdef"]

I don't understand your problem. Please add a clear example of what you try to achieve — Alexis, Jun 07 '19 at 15:24
Possible duplicate of [Simplest code for array intersection in javascript](https://stackoverflow.com/questions/1885557/simplest-code-for-array-intersection-in-javascript) — Cid, Jun 07 '19 at 15:26
@WilliamLohan Please see the edit for an example. I don't think it'll work if I want to check if say "abcdef"(`arrToFilter[i]`) has "abc" or "def" — Eagle, Jun 07 '19 at 15:31

Prince Devadoss · Accepted Answer · 2019-06-07T15:46:17.150

1

Simple way is using some and filter,

var string = 'ad,kk,sb';
var array = ['adik', 'klop', 'pp'];

var stringers = string.split(',');
var result = array.filter((arr) => {
    var isPresent = stringers.some(stringer => arr.includes(stringer));
    return isPresent ? true : false;
});

console.log(result);

edited Jun 07 '19 at 15:46

answered Jun 07 '19 at 15:27

Prince Devadoss

416
3
6

Please see the edit, as I don't think this code will give the desired result if I have one of the elements in `array` as `'klmn'`. Thanks! – Eagle Jun 07 '19 at 15:42
Editted according to your criteria. – Prince Devadoss Jun 07 '19 at 15:46
@Eagle we can simply do using filter and some. – Prince Devadoss Jun 07 '19 at 15:49
Oh okay. Thanks a lot – Eagle Jun 07 '19 at 16:08

score 1 · Answer 2 · answered Jun 07 '19 at 15:38

You need to iterate both arrays

let arrToFilter = ['abcqwer', 'pizza', 'definition', 'abcdef', 'example'];
let arrOutput = [];
let arrInput = document.getElementById('inputBox').value.split(',');

arrToFilter.forEach(filter => {
  arrInput.forEach(input => {
    if (!!input && filter.includes(input)) {
      arrOutput.push(filter);
    }
  });
});
//                      distinct the output
return arrOutput.filter((v, i, a) => i === a.indexOf(v));

How to check if any of the strings from an array with variable length are present in another string?

2 Answers2