import BaseModel from './base.model'; const AdditionModel = Object.create(BaseModel); AdditionModel.generate = function(n, level) { const equals = []; const notequals = []; const target = level + 5; const midpoint = Math.ceil(target / 2); let g1, g2, b1, b2; for (let i = 1; i < midpoint; i++) { g1 = i; g2 = target - i; b1 = Math.max(1, i - Math.ceil(Math.random() * 3)); b2 = Math.max(1, target - i - Math.ceil(Math.random() * 3)); equals.push(`${g2}+${g1}`); equals.push(`${g1}+${g2}`); notequals.push(`${b2}+${b1}`); notequals.push(`${b1}+${b2}`); } return this.buildResults(equals, notequals, n); }; AdditionModel.getTitle = (level) => { return `Equals ${level + 5}`; }; AdditionModel.getError = (value, level) => { return `Oops! ${value} does not equal ${level + 5}.`; }; export default AdditionModel;