# Mapping a score to a string

function score_to_grade(score1) {

var score = 100 - score1;

if (score == 100)
return 'A+';
else if (score > 93)
return 'A';
else if (score > 87)
return 'A-';
else if (score > 81)
return 'B+';
else if (score > 69 )
return 'B';
else if (score > 63 )
return 'B-';
else if (score > 56 )
return 'C+';
else if (score > 44 )
return 'C';
else if (score > 38 )
return 'C-';
else if (score > 32 )
return 'D+';
else if (score > 19 )
return 'D';
else if (score == 0 )
return 'F';
else
return 'D-';
}


function score_to_grade(pointsLost) {

// A more meaningful name to what's subtracted from the total
var score = 100 - pointsLost

// A map of grade to score in "at least" basis. Examples, an A is at least 93.
// You can easily add and remove mappings here
var map = [
['A+', 100],
['A', 93],
['A-', 87],
['B+', 81],
['B', 69],
['B-', 63],
['C+', 56],
['C', 44],
['C-', 38],
['D+', 32],
['D', 19],
['D-', 1],
['F', 0]
]

// Loop through the map and check if the score is at least a certain level
for (var i = 0; i < map.length; i++) {
if (score >= map[i][1]) return map[0];
}
}

• That assumes iterating over the properties of an object is in definition order... which you shouldn't... – Jeff Mercado Oct 26 '13 at 0:55

A switch statement would serve you much better in this case.

I'm not quite sure what the line var score = 100 - score1; does. is score1 the number of points the test-taker lost? It could use a much better name, such as pointsLost.

• Perhaps it is just some kind of conversion. In GER we have some strange dual grading schemes: 1) [1,2,3,4,5,6] which is equivalent to US [A,B,C,D,E,F] but on the other hand a scoring system [15/14/13, 12/11/10, 9/8/7, 6/5/4, 3/2/1, 0] where you would have to write a conversion from the lower to the higher. Perhaps in this case there is a similar case. We never know ;) – Thomas Junk Oct 26 '13 at 0:36