function alphabetSubsequence(str) {
    //  write code here.
    //Split it so we can map through the array
    const stringToArray = str.split('')
    const output = stringToArray.map((e, index) => {
        // Check if next strings index UTF-16 code is the same or greater than the previous 
        return str.charCodeAt(index) >= str.charCodeAt(index + 1)
        //Return false on each element if it isnt following ABC in correct order
            ? false
            : true
    })
    //So now output should store an array with:
    //  "false, false, true", or
    //  "true, true, true"
    //So if all of the elements are true int he array, then we return true
    return output.every(element => element === true)
}

alphabetSubsequence('yookmokk')

/**
* Test Suite 
*/
describe('alphabetSubsequence()', () => {
    it('returns false when it has duplicate letters', () => {
        // arrange
        const str = 'effg';

        // act
        const result = alphabetSubsequence(str);

        // log
        console.log("result 1: ", result);

        // assert
        expect(result).toBe(false);
    });

    it('returns false when NOT in ascending a - z order', () => {
        // arrange
        const str = 'cdce';

        // act
        const result = alphabetSubsequence(str);

        // log
        console.log("result 2: ", result);

        // assert
        expect(result).toBe(false);
    });

    it('returns true whenno duplicates and is ascending a - z order ', () => {
        // arrange
        const str = 'ace';

        // act
        const result = alphabetSubsequence(str);

        // log
        console.log("result 3: ", result);

        // assert
        expect(result).toBe(true);
    });
});