IQueryable is an interface in .NET that allows you to build queries against a data source, like a database, without actually executing them until you iterate over the results. It's kind of like writing a SQL query, but instead of getting the results right away, you get an object that represents the query, which you can modify or combine with other queries before finally executing it.

How to use it in a sentence

• "I'm not sure why this query is so slow - oh wait, it's because some idiot used IQueryable to build a massive query with like 20 joins and then didn't actually execute it until the very end!"

• "Dude, check out this sweet IQueryable query I just wrote - it's going to revolutionize the way we search for cat videos on our site."

If you actually want to learn more...

• IQueryable vs IEnumerable - This article breaks down the differences between IQueryable and its less fancy cousin IEnumerable, so you can impress your coworkers with your vast knowledge of .NET interfaces.

• Optimizing IQueryable - If you really want to nerd out, this Microsoft doc dives deep into how to optimize your IQueryable queries for maximum performance. Perfect for when the PM is breathing down your neck about page load times.

• Building Complex Queries with IQueryable - For those times when a simple "SELECT * FROM table" just won't cut it, this blog post shows you how to use IQueryable to build complex queries that will make your DBA weep with joy (or possibly terror).

Note: the Developer Dictionary is in Beta. Please direct feedback to skye@statsig.com.