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## Saturday, July 28, 2012

### LINQ interview questions part 3

In this post, we will do a quick review of LINQ operators Any() and All().

Question 1: Using LINQ, determine if any word in a list contains the substring “ei”.

` `
`    string[] words = { "believe", "relief", "receipt", "field" };`
`    bool iAfterE = words.Any(w => w.Contains("ei"));`
`    Console.WriteLine("list has words that contains 'ei': {0}", iAfterE);`

Question 2: Using LINQ, return a grouped list of products only for categories that have at least one product that is out of stock.

In this case, we run any over a grouping as shown below:

` `
`    List<Product> products = GetProductList();`
`    var productGroups =`
`        from p in products`
`        group p by p.Category into g`
`        where g.Any(p => p.UnitsInStock == 0)`
`        select new { Category = g.Key, Products = g };`

Question 3: Determine if an array of numbers contains all odds.

`int[] numbers = { 1, 11, 3, 19, 41, 65, 19 };`
`bool onlyOdd = numbers.All(n => n % 2 == 1);`
`Console.WriteLine("The list contains only odd numbers: {0}", onlyOdd);`

Question 4: Using LINQ, return a grouped list of products only for categories that have all of their products in stock.

` `
`    List<Product> products = GetProductList();`
` `
`    var productGroups =`
`        from p in products`
`        group p by p.Category into g`
`        where g.All(p => p.UnitsInStock > 0)`
`        select new { Category = g.Key, Products = g };`
`    `

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