How to compare two string in javascript? [duplicate]

Question

I have two string and want to check if one includes the other. Any ideas how to compare them properly?

let str1 = 'love you too much';
let str2 = 'lo ou to uc';

if (str1.includes(str2)) {
  console.log('str1 includes str2');
} else {
  console.log('str1 does not include str2');
};

When I use the includes method I get the result 'False'.

str1 does not include str2. includes tests for a substring. You’re looking for a subsequence test, instead. — Sebastian Simon
– Sebastian Simon, Commented Dec 18, 2022 at 21:46
How exactly is str2 supposed to be included in str1? What are the criteria? — Pointy
– Pointy, Commented Dec 18, 2022 at 21:47

Nora Söderlund · Accepted Answer · 2022-12-18 21:52:29Z

0

Given the criteria that each segment in str2 should be split by a whitespace, in where all must be found in str1: Iterate through each segment and use String.includes on each case.

let str1 = 'love you too much';
let str2 = 'lo ou to uc';

function stringIncludesSubstrings(haystack, needles) {
  needles = needles.split(' ');
  
  for(let index = 0; index < needles.length; index++) {
    if(!haystack.includes(needles[index]))
      return false;
  }
  
  return true;
};

if (stringIncludesSubstrings(str1, str2)) {
  console.log('str1 includes str2');
} else {
  console.log('str1 does not include str2');
}

answered Dec 18, 2022 at 21:52

Nora Söderlund

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