Someone can explain this coding to me.
[ x*y | x <- [2,5,10], y <- [8,10,11], x*y > 50]
I don't understand the meaning of this | symbol in haskell
symbol '|' has the same meaning as symbol '|' in math (set theory). You just should read it like 'such that'. In math the symbol '|' sometimes is replaced by ':'.
symbol '<-' is read as 'is drawn from'.
And the expression x <- [2,5,10] is called a generator. A list comprehension can have more than one generator, with successive generators being separated by commas.
List comprehensions can also use logical expressions called guards to filter the values produced by earlier generators. If a guard is True, then the current values are retained, and, if it is False, then they are discarded. For example, the comprehension [x | x <- [1..10], even x] produces the list [2,4,6,8,10] of all even numbers from list [1..10].
Hope it would help you to understand the meaning of symbol '|' and '<-' in list comprehensions.