Array contains partial and exact match

arrayContains.js

var allowedURLs = [
    "https://www.google.com",
    "https://www.youtube.com/watch?v=mp5WJwT7HW0",
    "https://www.youtube.com"
];

function arrayContains(targetArray, stringTofind, exactMatch) {
    var matches = targetArray.filter(function (aItem) {
        if (exactMatch)
            return (stringTofind === aItem);
        else
            return (stringTofind.indexOf(aItem) != -1);
    });
    return matches;
}


var matches = arrayContains(allowedURLs, "https://www.youtube.com/watch?v=mp5WJwT7HW0");
if(matches.length > 0){
    console.log('found match!')
} else{
    console.log('no')
}