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| 1 | +const assert = require('assert') |
| 2 | +const { forEach, map } = require('./index') |
| 3 | + |
| 4 | +const test = (desc, fn) => { |
| 5 | + console.log('----', desc) |
| 6 | + try { |
| 7 | + fn() |
| 8 | + } catch (err) { |
| 9 | + console.log(err.message) |
| 10 | + } |
| 11 | +} |
| 12 | + |
| 13 | +test('The forEach function', () => { |
| 14 | + let sum = 0 |
| 15 | + forEach([1, 2, 3], (value) => { |
| 16 | + sum += value |
| 17 | + }) |
| 18 | + |
| 19 | + // Optionally we can pass a third argument of an error message |
| 20 | + assert.strictEqual(sum, 6) |
| 21 | + // assert.strictEqual(sum, 7, 'Expected forEach to sum the array') |
| 22 | +}) |
| 23 | + |
| 24 | +test('The map funciton', () => { |
| 25 | + const result = map([1, 2, 3], (value) => { |
| 26 | + return value * 2 |
| 27 | + }) |
| 28 | + |
| 29 | + // assert.deepStrictEqual(result, [2, 4, 6]) |
| 30 | + assert.deepStrictEqual(result, [2, 4, 7]) |
| 31 | +}) |
| 32 | + |
| 33 | +// Long way of testing |
| 34 | +// test('The map funciton', () => { |
| 35 | +// const result = map([1, 2, 3], (value) => { |
| 36 | +// return value * 2 |
| 37 | +// }) |
| 38 | + |
| 39 | +// assert.strictEqual(result[0], 2) |
| 40 | +// assert.strictEqual(result[1], 4) |
| 41 | +// assert.strictEqual(result[2], 6) |
| 42 | +// // assert.strictEqual(result[2], 7) // This throws an error |
| 43 | +// }) |
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