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flatten kata
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| exports.flatten = (input) => input.toString().split(',').map(Number) |
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| const assert = require('assert') | |
| const { flatten } = require('./index') | |
| assert.deepEqual(flatten([[1, 2, [3]], 4]), [1, 2, 3, 4]) | |
| assert.deepEqual(flatten([[1, 2, [3, 4]], 5]), [1, 2, 3, 4, 5]) |
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