| 1 | "use strict";
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| 2 |
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| 3 | module.exports = function() {
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| 4 | let table = new Map();
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| 5 | let unusedKeys = new Set();
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| 6 |
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| 7 | this.set = function(key, value) {
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| 8 | if (table.has(key)) {
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| 9 | throw new ReferenceError(`The variable ${key} has already been defined`);
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| 10 | }
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| 11 | table.set(key, value);
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| 12 | unusedKeys.add(key);
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| 13 | };
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| 14 | this.get = function(key) {
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| 15 | if (!table.has(key)) {
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| 16 | throw new ReferenceError(`The variable ${key} does not exist`);
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| 17 | }
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| 18 | unusedKeys.delete(key);
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| 19 | return table.get(key);
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| 20 | };
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| 21 | this.end = function() {
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| 22 | if (unusedKeys.size) {
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| 23 | throw new SyntaxError(`The variable "${Array.from(unusedKeys)[0]}" is not used`);
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| 24 | }
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| 25 | };
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| 26 | }; |
| \ | No newline at end of file |