mutations.js

/*

Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.

For example, ["hello", "Hello"], should return true because all of the letters in the second string are present in the first, ignoring case.

The arguments ["hello", "hey"] should return false because the string "hello" does not contain a "y".

Lastly, ["Alien", "line"], should return true because all of the letters in "line" are present in "Alien".

*/

function mutation(arr) {

    let first = arr[0].toLowerCase();
    // console.log(first);

    let second = arr[1].toLowerCase();
    // console.log(second);

    for (var i = 0; i < second.length; i++) {

        if (first.indexOf(second[i]) < 0)
            return false;
    }
    return true;
}

mutation(["hello", "hey"]);
mutation(["hello", "Hello"]) //should return true.
mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"]) //should return true.
mutation(["Mary", "Army"]) //should return true.
mutation(["Mary", "Aarmy"]) //should return true.
mutation(["Alien", "line"]) //should return true.
mutation(["floor", "for"]) //should return true.
mutation(["hello", "neo"]) // should return false.
mutation(["voodoo", "no"]) //should return false.