The keyword that rounds a number to a specified number of decimal places and converts it to a string is _____.
Sorry, that's incorrect. The correct answer:
toFixed
A number modified by toFixed winds up as a ______. Answer with 1 word.
Sorry, that's incorrect. The correct answer:
string
To force toFixed to round up in the case of an ambiguity, change the last decimal value to a ___. Answer with a number.
Sorry, that's incorrect. The correct answer:
6
The statement will round the number to an integer. Fill in the blank.
var newNum = oldNum.toFixed___;
Sorry, that's incorrect. The correct answer:
()
Drag-and-drop. Holding down the left mouse button, drag the pieces to form a statement that rounds the number represented by rawNum to 2 decimal places and assigns it to num.
Click in the box and type the next character. I'll autocomplete. Don't type spaces.
Code a statement that rounds a number represented by num to 4 places, converts it to a string, and assigns it to newNum, which hasn't been declared beforehand.
The correct code is:
var newNum = num.toFixed(4);
Fail-safe coding. If you type the wrong character, I'll cancel the keystroke. Type spaces.
Code a statement that rounds a number represented by num to no places, converts it to a string, and assigns it to newNum, which hasn't been declared beforehand.
The correct code is:
var newNum = num.toFixed();
Code a statement that rounds a number represented by n to 3 places, converts it to a string, and assigns it to dec3, which hasn't been declared beforehand.
Sorry, that's incorrect. The correct code:
var dec3 = n.toFixed(3);
Code a statement that rounds a number represented by n to no places, converts it to a string, and assigns it to intgr, which hasn't been declared beforehand.
Sorry, that's incorrect. The correct code:
var intgr = n.toFixed();
Code a statement that rounds a number represented by a variable to your choice of places, converts it to a string, and assigns it to another variable, which hasn't been declared beforehand.
Sorry, that's incorrect. An example:
var nStr = n.toFixed(2);
Code a statement that rounds a number represented by a variable to no places, converts it to a string, and assigns it to the same variable.
Sorry, that's incorrect. An example:
num = num.toFixed();
In a single statement round a number represented by a variable to 2 places, convert it to a string, convert it back to a number, and assign it to the same variable.
Sorry, that's incorrect. The correct answer:
n = Number(n.toFixed(2));
Time goal: 25 seconds. Code a statement that rounds a number represented by n to 3 places, converts it to a string, and assigns it to dec3, which hasn't been declared beforehand.
Sorry, that's incorrect. The correct code:
var dec3 = n.toFixed(3);
Time goal: 25 seconds. Code a statement that rounds a number represented by n to no places, converts it to a string, and assigns it to myInteger, which hasn't been declared beforehand.
Sorry, that's incorrect. The correct code:
var myInteger = n.toFixed();
Time goal: 30 seconds. Code a statement that rounds a number represented by a variable to your choice of places, converts it to a string, and assigns it to another variable, which hasn't been declared beforehand.
Sorry, that's incorrect. An example:
var nStr = n.toFixed(2);
Time goal: 30 seconds. Code a statement that rounds a number represented by a variable to no places, converts it to a string, and assigns it to the same variable.
Sorry, that's incorrect. An example:
num = num.toFixed();
Time goal: 40 seconds. In a single statement round a number represented by a variable to 2 places, convert it to a string, convert it back to a number, and assign it to the same variable.
Sorry, that's incorrect. The correct answer:
n = Number(n.toFixed(2));
Time goal: 45 seconds. Code the first line of an if statement that tests whether the number represented by num, rounded to 2 digits and converted to a string, has more than 4 characters in it.
Sorry, that's incorrect. The correct answer:
if (num.toFixed(2).length > 4) {
Live coding exercise:
- Assign a number with many decimal places to a variable.
- Code an alert that displays the number rounded to 2 decimal places and converted to a string.
- Click the Run It button to run your code live.
Live coding exercise:
- Assign a number with many decimal places to a variable.
- Code an alert that displays the number rounded to no decimal places and converted to a string.
- Click the Run It button to run your code live. Try running it several times.
Congratulations. You've aced all the exercises for this chapter.
To practice on your own, or to check code you believe shouldn't have been scored as incorrect, go to jsFiddle. See my brief demo of jsFiddle.
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Email me to give me a compliment, complaint, or correction. I'll respond.
All of my books include free interactive online exercises that make the knowledge stick.
