arrow function with brackets giving wrong answer

Question

const shouldCancelExam = grades => {
    return grades.some(grade=>{grade>=18});
}

the above gives False for shouldCancelExam([10, 12, 10, 18])

However, the below is giving the correct output which is True. What is causing the difference?

const shouldCancelExam = grades => {
    return grades.some(grade=> grade>=18);
}

The second example uses implicit return. The first returns nothing from the callback function. — Brian Thompson, May 13 '20 at 20:27
To explain a bit further, by wrapping in brackets it changes from a return value to a block of code to be run — Moshe Sommers, May 13 '20 at 20:28

score 1 · Accepted Answer · answered May 13 '20 at 20:46

Always remember that when you use arrow function and have a single statement you do not require {} if you using {} then you have to write return type keyword

    const shouldCancelExam = grades => {
            return grades.some(grade=> {
                             return grade>=18
    });
 }


const shouldCancelExam = grades => {
            return grades.some(grade=> grade>=18);
        }

arrow function with brackets giving wrong answer

1 Answers1