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Increment and Decrement

In Python we use the += operator to increment a number. That operator works in JavaScript as well, but JS also has a ++ operator for when you only want to increment by 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.