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This ensures that one of the following two conditions is true: either the parameter we receive in the `findOne()` method is a number (as expected in our call to `this.catsService.findOne())`), or an exception is thrown before the route handler is called.
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This ensures that one of the following two conditions is true: either the parameter we receive in the `findOne()` method is a number (as expected in our call to `this.catsService.findOne()`), or an exception is thrown before the route handler is called.
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