Compare Arrays Of Sub-string

How can I check if an array of strings contains part of words stored in another array of strings ? Let's say I've declared these three arrays : array1 = ['Lorem', 'ipsum', 'dolor'

Solution 1:

• For every element in keywords array (use .every())
• There must be some element in other array (use .some())
• That includes the string currently in consideration (use .includes())

Demo:

let array1   = ["Lorem", "ipsum", "dolor", "sit", "amet"],
    array2   = ["Lorem", "ipsum"],
    keywords = ["ipsum", "dol"];

let compare = (a, k) => k.every(s => a.some(v => v.includes(s)));

console.log(compare(array1, keywords));
console.log(compare(array2, keywords));

Docs:

• Array.prototype.every()
• Array.prototype.some()
• String.prototype.includes()

Solution 2:

You can use Array.every

let contains = keywords.every(k => array1.findIndex(a => a.indexOf(k) > -1) > -1)

Solution 3:

function arrayContains(array1,array2){
 var res=0;
 for (var i=0;i<array1.length;i++){
  for (var j=0;i<array2.length;j++){
    if (array1[i]==array2[j])
        res++
   } 
 }
 return res==array2.length//if res is eqaul to array2.length then all elements of array2 are inside array1;
}

Solution 4:

I would use indexOf instead of includes as includes do not work in IE browsers. Browser compatibility

let array1   = ["Lorem", "ipsum", "dolor", "sit", "amet"],
    array2   = ["Lorem", "ipsum"],
    keywords = ["ipsum", "dol"];

let compare = (a, k) => k.every(s => a.some(v => v.indexOf(s) !== -1));

console.log(compare(array1, keywords));
console.log(compare(array2, keywords));

Solution 5:

var array1 = ['a','b','c'];
var array2 = ['g','f','h'];

var keys = ['a','g'];

function checkIfExists(key, arr) {
   if (arr.indexOf(key) != -1) {
     console.log('Key ' + key + ' exists in array');
   } else {
     console.log('Key ' + key + ' does not exists in array');
   } 

}

for (var i = 0; i < keys.length; i++) {
    checkIfExists(keys[i], array1);
}

for (var i = 0; i < keys.length; i++) {
    checkIfExists(keys[i], array2);
}

Output :

Key a exists in array Key g does not exists in array Key a does not exists in array Key g exists in array