Lists

• Official documentation
• Enum official documentation

Literals

xs = [1, 2, 3]
ys = [ 1, 2 | [3, 4] ]

List Operations

Syntax	Description
hd	Head
tl	Tail
x in xs	Membership
xs ++ ys	Concatenation
xs -- ys	Removes first occurrence of each y from xs

Indexing operations

Syntax	Description
Enum.at(xs, i, default \\ nil)	Indexing, returns elt or default
Enum.fetch(xs, i)	Indexing, returns {:ok, elt} or :error
Enum.fetch!(xs, i)	Indexing, returns elt or raises exception

Looping Operations

Syntax	Description
Enum.all?(xs, f \\ id)	Check if all f(x) are truthy
Enum.any?(xs, f \\ id)	Check if some f(x) is truthy
Enum.count(xs, f)	Count how many f(x) are truthy
Enum.each(xs, f)	Calls f for every x
Enum.filter(xs, f)	Returns those x where f(x) is truthy
Enum.find(xs, default \\ nil, f)	Finds first x for which f(x) is truthy
Enum.find_index(xs, f)	Index of first x for which f(x) is truthy, or nil
Enum.flat_map(xs, f)	Flattening of [ f(x1), f(x2), ... ]
Enum.map(xs, f)	[f(x1), f(x2), ... ]
Enum.reduce(xs, f)	Fold with f(x, acc)
Enum.reduce(xs, init, f)	Fold with f(x, acc)
Enum.reject(xs, f)	Returns those x where f(x) is falsey
Enum.sum(xs)	Returns sum
Enum.with_index(xs, start_i)	Pairs items up with index {x[i], i}
Enum.zip(xss)	Zips xss into list of tuples
Enum.zip(xs, ys)	Zips xs and ys into list of tuples

Misc Operations

Syntax	Description
Enum.drop(xs, n)	Drops n first elements of xs
Enum.join(xs, sep \\ "")	Produces string
Enum.length(xs)	Length of xs
Enum.max(xs, if_empty_func)	Maximum
Enum.max_by(xs, f, if_empty_func)	Maximum
Enum.min(xs, if_empty_func)	Minimum
Enum.min_by(xs, f, if_empty_func)	Minimum
Enum.random(xs)	Random element from xs
Enum.reverse(xs)	Reverses order
Enum.shuffle(xs)	Shuffles order
Enum.slice(xs, range)	Returns slice
Enum.slice(xs, start, len)	Returns slice
Enum.sort(xs)	Sorts
Enum.sort_by(xs, key_f, sorter_f \\ &<=/2)	Sorts
Enum.split(xs, n)	Splits xs in two parts where first part contains n elements
Enum.uniq(xs)	Removes duplicates
Enum.uniq_by(xs, eq_f)	Removes duplicates