Array Operations

Length, filtering, mapping, searching, grouping and ordering

Function	What it does
all	Check if all elements match predicate
any	Check if any element matches predicate
concat	The two arrays joined end to end
count	How many elements the predicate holds for
filter	Filter array by predicate
find	The first matching element, or nil
findIndex	The position of the first matching element, or -1
findLast	The last matching element, or nil
first	The first element, or nil when the array is empty
flatten	Nested arrays flattened into one
groupBy	Groups elements into a map keyed by the expression
last	The last element, or nil when the array is empty
len	Array or string length
map	Transform each element
none	True when the predicate holds for no element
one	True when the predicate holds for exactly one element
reduce	Folds the elements into one value; the running total is #acc and the element is #
sort	The elements in ascending order
sortBy	The elements ordered by the expression
take	The first count elements