Final grade calculator

commands/number-edit/final-grade-calculator.js

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+const { Command } = require('discord.js-commando');
+const { above100, above92, above88, above80, below80 } = require('../../assets/json/final-grade-calculator');
+
+module.exports = class FinalGradeCalculatorCommand extends Command {
+	constructor(client) {
+		super(client, {
+			name: 'final-grade-calculator',
+			aliases: ['final-grade', 'roger-hub'],
+			group: 'number-edit',
+			memberName: 'final-grade-calculator',
+			description: 'Determines the grade you need to make on your final to get your desired course grade.',
+			args: [
+				{
+					key: 'current',
+					label: 'current grade',
+					prompt: 'What is your current grade in the class?',
+					type: 'integer',
+					min: 0
+				},
+				{
+					key: 'desired',
+					label: 'desired grade',
+					prompt: 'What is the minimum grade you want in the class?',
+					type: 'integer',
+					min: 0
+				},
+				{
+					key: 'weight',
+					prompt: 'What percentage of your grade is the final worth?',
+					type: 'integer',
+					max: 100,
+					min: 0
+				}
+			]
+		});
+	}
+
+	run(msg, { current, desired, weight }) {
+		const weightDecimal = weight / 100;
+		const remainingWeight = 1 - weightDecimal;
+		const required = Math.round(((desired - (current * remainingWeight)) / weightDecimal) * 100);
+		const diff = current - desired;
+		let text;
+		if (required > 100) text = above100[Math.floor(Math.random() * above100.length)];
+		else if (required > 92 || diff > weight * 0.3) text = above92[Math.floor(Math.random() * above92.length)];
+		else if (required > 88 || diff > 0) text = above88[Math.floor(Math.random() * above88.length)];
+		else if (required > 80 || diff > weight * -0.3) text = above80[Math.floor(Math.random() * above80.length)];
+		else text = below80[Math.floor(Math.random() * below80.length)];
+		return msg.say(`You will need to score at least ${required}% on your final to get a ${desired}% overall. ${text}`);
+	}
+};