I’m on the Practice JavaScript Syntax: Variables, Data Types, Conditionals, Etc Excercise where it’s supposed to have you write a function to get finalGrade. I’m struggling to understand why the || works and not && in the following. average >= 0 && average <= 59 doesn’t work when trying to find out if average is greater than or equal to = and average is less than or equal to 59. It just doesn’t work like that for me.
const finalGrade = (grade1, grade2, grade3) => {
if ((grade1 < 0 || grade1 > 100) || (grade2 < 0 || grade2 > 100) || (grade3 < 0 || grade3 > 100)) {
return 'You have entered an invalid grade.';
}
let average = grade1 + grade2 + grade3 / 3;
if (average >= 0 || average <= 59) { // The || works here but not &&
return 'F';
} else {
return 'BS';
}
}
console.log(finalGrade(59, 52, 52));