JAVASCRIPT

Comparing and Filtering two arrays

var array1 = ['apples', 'grapes', 'oranges', 'banana'],
  array2 = ['potato', 'pears', 'grapes', 'berries', 'apples', 'oranges'];

var intersection = array1.filter(function(e) {
  return array2.indexOf(e) > -1;
});

console.log(intersection);

comparing two arrays with filter javascript

var fullWordList = ['1','2','3','4','5'];
var wordsToRemove = ['1','2','3'];

var filteredKeywords = fullWordList.filter(
  word=>!wordsToRemove.includes(word)
//or
//word=>wordsToRemove.indexOf(word)<0
);