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| // Railslove JavaScript programming exercise A1 | |
| // | |
| // To run the following exercise you need to have mocha installed. | |
| // Install mocha with yarn global add mocha or npm install -g mocha | |
| // | |
| // Then watch the output of `mocha filter.js` and see 4 of 5 failing tests. | |
| // | |
| // The task is to filter a given collection (L#35) for entries that contain unique pairs. | |
| // While filtering return the same structure and keep the ranking. | |
| // Write code in the body of the filter method to make the tests pass. |