There is a typo in the Cheatsheet “Overview with react” that may cause some confusion.
On the example of “Remainder / Modulo Operator”, it shows the following code:
console.log("A year has " + weeksInYear + "weeks " and "daysLeftOver " + days)
Instead, the right code to expect may be as follows:
console.log("A year has " + weeksInYear + "weeks and " + daysLeftOver + "days")
Thank you for checking it out and correcting if necessary.