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41 lines
1.1 KiB
41 lines
1.1 KiB
import BaseModel from './base.model';
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const SubtractionModel = Object.create(BaseModel);
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SubtractionModel.generate = function(n, level) {
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const equals = [];
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const notequals = [];
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const target = level + 2;
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const upperLimit = target * 10;
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let g1, g2, b1, b2, b3;
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for (let i = target + 1; i < upperLimit; i++) {
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g1 = i;
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g2 = i - target;
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b1 = i + Math.ceil(Math.random() * 3);
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b2 = Math.max(1, i - Math.ceil(Math.random() * 3));
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b3 = i - target;
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// console.log(`(${i}) ${g1} - ${g2} = ${g1 - g2}`);
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// console.error(`(${i}) ${b1} - ${b3} = ${b1 - b3}`);
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// console.error(`(${i}) ${b2} - ${b3} = ${b2 - b3}`);
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equals.push(`${g1}-${g2}`);
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notequals.push(`${b1}-${b3}`);
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notequals.push(`${b2}-${b3}`);
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}
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return this.buildResults(equals, notequals, n);
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};
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SubtractionModel.getTitle = (level) => {
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return `Equals ${level + 2}`;
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};
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SubtractionModel.getError = (value, level) => {
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return `Oops! ${value} does not equal ${level + 2}.`;
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};
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export default SubtractionModel;
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