Functions - JavaScript: Novice to Ninja - page 131

The ask() function accepts a question parameter. This combination of function name
and parameter name is used to make the code very descriptive ― it reads almost like an
English sentence: "Ask the question". It uses a prompt dialog and returns the text entered
by the player, which is then saved in a variable called answer .
The check() function is written after the ask() function and has an answer parameter.
This combination of function name and parameter name again make the code read more
like an English sentence. Naming functions in this way means that we don't need to use
comments to explain what the code does in this case, as it's self-explanatory:
scripts.js (excerpt)
function check(answer) {
if(answer === quiz[i][1]){ // quiz[i][1] is the ith
answer
alert("Correct!");
// increase score by 1
score++;
} else {
alert("Wrong!");
}
}
This function uses the same logic that we used in the last chapter to check if the answer
entered by the player is the same as the answer stored in the array. If it is, then we increase
the score by 1 and if it isn't then we show an alert dialog to say so.
When all the questions have been asked and all the answers have been checked, the pro-
gram breaks out of the loop and then invokes the gameOver() function. This is also
defined at the bottom of the playQuiz function as follows:
scripts.js (excerpt)
function gameOver(){
// inform the player that the game has finished and
tell them
↵ how many points they have scored
alert("Game Over, you scored " + score + " points");
}
}