| 1 | var _ = require('underscore');
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| 2 |
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| 3 |
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| 4 | exports.calculate = function (credits) {
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| 5 | var obj = {
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| 6 | total_credits: exports.getTotalCredits(credits)
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| 7 | };
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| 8 | obj.weighted_average = exports.getWeightedAverage(credits, obj.total_credits);
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| 9 | return obj;
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| 10 | };
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| 11 |
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| 12 | exports.getTotalCredits = function (credits) {
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| 13 | return _.reduce(credits, ((a, b) => a + b.credits_received), 0);
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| 14 | };
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| 15 |
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| 16 | exports.parseGrade = function (grade) {
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| 17 | if (grade === 'BEST') {
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| 18 | return 6;
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| 19 | }
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| 20 | var parsed = parseFloat(grade);
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| 21 | if (_.isNaN(parsed)) {
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| 22 | return 1;
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| 23 | }
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| 24 | return parsed;
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| 25 | };
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| 26 |
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| 27 | exports.getWeightedAverage = function (credits, total_credits) {
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| 28 | if (!credits.length) {
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| 29 | return 0;
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| 30 | }
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| 31 | var avg = _.reduce(credits, (a, b) => {
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| 32 | return b.credits_received * exports.parseGrade(b.grade) + a;
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| 33 | }, 0) / total_credits;
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| 34 | return Math.round(avg * 100) / 100;
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| 35 | };
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| 36 |
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