I have a function that uses a switch case to return different results depending on the input. The function, called "getTimeAgo," takes in two parameters: "date" (which can be either a Date object or a string) and "mode" (which can only be either "days" or "minutes").
export function getTimeAgo(
date: Date | string,
mode: "days" | "minutes" = "days"
) {
if (typeof date === "string") {
date = new Date(date);
}
switch (mode) {
case "days":
return calculateDaysAgo(date);
case "minutes":
return calculateMinutesAgo(date);
default:
return { timeAgo: "", numFormat: null };
}
}
The calculateDaysAgo function:
function calculateDaysAgo(date: Date) {
let timeAgo = "";
const curDate = new Date();
const days = Math.round(
(date.valueOf() - curDate.valueOf()) / (1000 * 60 * 60 * 24)
);
if (days === 0) {
timeAgo = "Ends today";
} else if (days < 0) {
const nonNegativeDays = days * -1;
timeAgo = `${nonNegativeDays} days behind`;
} else {
timeAgo = `${days} days left`;
}
if (days === 1) {
timeAgo = timeAgo.replace("days", "day");
}
return { timeAgo, numFormat: days };
}
Now let's call the function to get the results:
const { timeAgo, numFormat: days } = getTimeAgo(date,"days");
In the variable "days," I'm encountering an error suggesting that it could be null. However, shouldn't the result always be non-null based on the selected "mode" of the function?