//option1
const alphabetSubsequence=(str)=> {
let array= str.split("")
let myset = new Set(array)
return  [...myset].sort().join("") === str
}

//option2
// const alphabetSubsequence=(str)=> {
// let split= str.split("")
// let array=[...new Set(str)]
// return array.length === split.length && array.sort().join("")===str
// }


/**
* 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);
    });
    
    it('returns false when NOT in ascending a - z order', () => {
        // arrange
        const str = 'zfwa';
        
        // act
        const result = alphabetSubsequence(str);

        // log
        console.log("result 2: ", result);
        
        // assert
        expect(result).toBe(false);
    });
   
    
});