Returning the Day of the Week as a String

In this exercise, you will create a function that returns the day of the week as a string.

1. Open BuiltInObjects/Exercises/DateUDFs.html for editing.
2. Write a dayAsString() function that returns the day of the week as a string, with "0" returning "Sunday", "1" returning "Monday", etc.
3. Write an enterDay() function that prompts the user for the day of the week (as a number) and then alerts the string value of that day by calling the dayAsString() function.
4. Write a getCurrentDay() function that alerts today's actual day of the week according to the user's machine.
5. Add a "CHOOSE DAY" button that calls the enterDay() function.
6. Add a "GET CURRENT DAY" button that calls the getCurrentDay() function.
7. Test your solution in a browser.

Solution:

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<script>
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	function dayAsString(num){
		var weekDays = [];
		weekDays[0] = "Sunday";
		weekDays[1] = "Monday";
		weekDays[2] = "Tuesday";
		weekDays[3] = "Wednesday";
		weekDays[4] = "Thursday";
		weekDays[5] = "Friday";
		weekDays[6] = "Saturday";
		
		return weekDays[num-1];
	}

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	function getCurrentMonth(){
		var today = new Date();
		alert(monthAsString(today.getMonth()+1));
	}
	
	function enterDay(){
		var userDay = prompt("What day of the week is it?", "");
		alert("Today is " + dayAsString(userDay) + ".");
	}

	function getCurrentDay(){
		var today = new Date();
		alert(dayAsString(today.getDay()+1));
	}
</script>

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	<input type="button" value="CHOOSE MONTH" onclick="enterMonth();">
	<input type="button" value="GET CURRENT MONTH" onclick="getCurrentMonth();"><br>
	<input type="button" value="CHOOSE DAY" onclick="enterDay();">
	<input type="button" value="GET CURRENT DAY" onclick="getCurrentDay();">

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Code Explanation