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Increment and Decrement

You can use += to increment a number by any amount, or the ++ operator to increment by just 1.

let bootdevCourseRating = 4;
bootdevCourseRating++;
console.log(bootdevCourseRating); // 5
bootdevCourseRating += 5;
console.log(bootdevCourseRating); // 10

And of course, there is a -- operator for decrementing by 1.

let bootdevCourseRating = 11;
bootdevCourseRating--;
console.log(bootdevCourseRating); // 10
bootdevCourseRating -= 5;
console.log(bootdevCourseRating); // 5

Assignment

Textio tracks how many messages have failed to send on a given day. Use the ++ operator in between the comments to increment the numFailedMessages.