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function alphabetSubsequence(str) {
// write code here.
let a =[...str] //convert str to arr to feed to set func
let b = new Set(a) //removes duplicates
//checks if the size of set and size of original string are same if not that means it has duplicate
if(a.length === b.size){
//console.log(a)
for (let i=1; i < a.length; i++){
// first do negative check if not there that means its positve
if(a[i].charCodeAt(0) < a[i-1].charCodeAt(0)){
console.log(a[i].charCodeAt(0))
console.log(a[i-1].charCodeAt(0))
return false
}
}
return true
}
else {
return false
}
}
/**
* 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 no duplicates and is NOT in ascending a - z order ', () => {
// arrange
const str = 'hjoi';
// act
const result = alphabetSubsequence(str);
// log
console.log("result 4: ", result);
// assert
expect(result).toBe(false);
});
});