What is the difference between Pattern Matching and Guards?

Question

I am very new to Haskell and to functional programming in general. My question is pretty basic. What is the difference between Pattern Matching and Guards?

Funct

Answer 1

For one, you can put boolean expressions within a guard.

For example:

Just as with list comprehensions, boolean expressions can be freely mixed with among the pattern guards. For example:

f x | [y] <- x
    , y > 3
    , Just z <- h y
    = ...

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Update

There is a nice quote from Learn You a Haskell about the difference:

Whereas patterns are a way of making sure a value conforms to some form and deconstructing it, guards are a way of testing whether some property of a value (or several of them) are true or false. That sounds a lot like an if statement and it's very similar. The thing is that guards are a lot more readable when you have several conditions and they play really nicely with patterns.