15_mutations.js

/*
Mutations

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) {
    for (let index = 0; index < arr[1].length; index++) {
        const element = arr[1][index].toLowerCase();
        if (!arr[0].toLowerCase().includes(element)) {
            return false
        }
        // console.log(element, arr[0].toLowerCase().includes(element));
    }
    return true
}

const testData = [
    ["Tiger", "Zebra"],
    ["Mary", "Aarmy"],
    ["Mary", "Army"],
    ["zyxwvutsrqponmlkjihgfedcba", "qrstu"],
    ["hello", "hey"],
    ["hello", "Hello"],
    ["Alien", "line"],
]

console.log(mutation(testData[0]));