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JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Build a Quiz Challenge, Part 1 Solution

Timothy Smith
Timothy Smith
2,072 Points
Posted by Timothy Smith
Timothy Smith
2,072 Points

My attempt was a lot lighter. How can I improve answer testing?

I was surprised to see how much shorter my code was compared to Dave's. I ran into an issue when trying to add answer testing though.

var queA = [['What color is the sun?','red'],['What do dogs eat?','meat'],['Are penguins slick','yes']];
var score = 0;

function print(score) {
  document.write('Congratulations, you scored ' + score + ' points!');
}

for (var i = 0; i < queA.length; i += 1) {
var answer = prompt(queA[i][0]);
    if (answer === queA[i][1]) {
        score += 1;
    }
}

print(score);

Why can't I use '.toLowerCase' on the answer variable inside of the if statement?

Timothy Smith
Timothy Smith
2,072 Points
Timothy Smith
Timothy Smith
2,072 Points

In the next video I realized I was using the print function wrong as well. Here is my updated code:

var queA = [['What color is the sun?','red'],['What do dogs eat?','meat'],['Are penguins slick','yes']];
var score = 0;

function print(message) {
  document.write(message);
}

for (var i = 0; i < queA.length; i += 1) {
var answer = prompt(queA[i][0]);
    if (answer === queA[i][1]) {
        score += 1;
    }
}

print('Congratulations, you scored ' + score + ' point(s)!');

2 Answers

Dan Johnson
Dan Johnson
40,533 Points
Dan Johnson
Dan Johnson
40,533 Points 
if (answer.toLowerCase() === queA[i][1]) {
    score += 1;
}

Works fine for me. Did you forget to add the parentheses when you tried?

Timothy Smith
Timothy Smith
2,072 Points
Timothy Smith
Timothy Smith
2,072 Points

Doh! I completely forgot about the parentheses. Thanks for that.

MONICA BUI
MONICA BUI
3,526 Points
MONICA BUI
MONICA BUI
3,526 Points

This is a piece of your code:

for (var i = 0; i < queA.length; i += 1) {
var answer = prompt(queA[i][0]); //NOT EFFICIENT The browser need to create a variable again and again
    if (answer === queA[i][1]) {
        score += 1;
    }
}

I suggest creating your variable OUTSIDE the loop, by doing this the browser doesn't have to create a variable every time it run through the loop, instead it just need to update the new value of the variable, like this: 

var answer; // create out side the loop
for (var i = 0; i < queA.length; i += 1) {
    answer = prompt(queA[i][0]); //every time the loop run the variable is updated with a new value
    if (answer === queA[i][1]) {
        score += 1;
    }
}

This is how I wrote my code:

var questionAndAnswer = [
['A', 'A'],
['B', 'B'],
['C', 'C']
];
var correct = 0;
var wrong = 0;
var ask;

for (var i = 0; i < questionAndAnswer.length; i+=1) {
    ask = prompt(questionAndAnswer[i][0]);
    if (ask.toUpperCase() === questionAndAnswer[i][1]) { 
        correct = correct+=1;
    } else {
        wrong = wrong +=1;
    }
}

function print(meg) {
 document.write(meg)
}
print("<p> You've got " + correct + " correct answers </p>")
print("<p> You've got " + wrong + " wrong answers </p>")

Cheers! Monica