Friday, June 16, 2017

What is the JavaScript variant of .Any() in LINQ(C#)?

Today during our ‘Bug Fix Friday’ we were discussing how to rewrite a rather complex loop construction using a more functional style syntax. As we were all C# developers, the equivalent of what we wanted to achieve in JavaScript was what C# offers through the .Any() LINQ operation.

So the discussion was if their was a similar approach possible in JavaScript?

And the answer is… of course! The Array.prototype.some() method did exactly what we needed.

From MDN:

some() executes the callback function once for each element present in the array until it finds one where callback returns a truthy value (a value that becomes true when converted to a Boolean). If such an element is found, some() immediately returns true. Otherwise, some() returns false. callback is invoked only for indexes of the array which have assigned values; it is not invoked for indexes which have been deleted or which have never been assigned values.

An example:

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