Fold: Difference between revisions
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{{primitive|f/y<br>x f/y}}
'''Fold''', also known as '''reduce''', '''foldl''' and '''over''', takes a [[dyadic]] function <code>f</code> and reduces an array <code>y</code> using it.
Fold is a very strong utility. For example, you can sum a list using <code>+/</code>.
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