Find sub-sequence in an array - Javascript

array_sub_sequence.js

function findSubsequence (arr = [], subArr = []) {
  let prevIndex = 0;
  
  for(let i = 0; i < subArr.length; i++) {
    const item = subArr[i];
    const index = arr.indexOf(item);
    
    if ( index >= 0) {
      if (prevIndex > index) return false;
      prevIndex = index;
    }
    return false;
  }
  return true;
}

console.log(findSubsequence([1,6,7,0,1,9,10,-1], [1,10,6]));