Utility of yield keyword in f sharp

So far I know, we use it mostly for list/array comprehension. Here is two codes:

 [ for x in range do (yield expression)]

else we can also drop the yield and still it works

 [ for x in range do expression]

So, is then what is use of yield in F#?

asked Mar 5 at 9:50

Clemens Bartholdy Clemens Bartholdy

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Often "syntactic sugar" is useful. In this case (1) yield has wider applicability than just list and array comprehensions: including custom ones; (2) when mixing with yield! it provides more syntactic consistency (and thus easier maintainability).
– Richard
Commented Mar 5 at 10:36
Note also that yield was not originally optional - you could either have -> (as opposed to do and have an implicit yield). There are also cases where it disambiguates an expression (i.e. yield implies it must match the sequence type as has been declared/inferred, whereas an expression without it might also be a unit 'statement'
– Ruben Bartelink
Commented Mar 5 at 16:37

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