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The following list contains syntax examples of how a range of element of an array can be accessed. In the following table: first – the index of the first element in the slice; last – the index of the last element in the slice; end – one more than the index of last element in the slice; len – the length of the slice (= end - first)
The second form is an example of UFCS. F#: List.zip list1 list2 Seq.zip source1 source2 Array.zip array1 array2: List.zip3 list1 list2 list3 Seq.zip3 source1 source2 source3 Array.zip3 array1 array2 array3: Haskell: zip list1 list2: zip3 list1 list2 list3: zipn list1 … listn: zipn for n > 3 is available in the module Data.List. Stops after ...
Array#map passes 3 arguments to func: the element, the index of the element, and the array. Unused arguments can be omitted. Unused arguments can be omitted. Stops at the end of List1 , extending the shorter arrays with undefined items if needed.
Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
Python has array index and array slicing expressions in lists, denoted as a[key], a [start: stop] or a [start: stop: step]. Indexes are zero-based, and negative indexes are relative to the end. Slices take elements from the start index up to, but not including, the stop index.
map function, found in many functional programming languages, is one example of a higher-order function. It takes as arguments a function f and a collection of elements, and as the result, returns a new collection with f applied to each element from the collection.
In the array of all elements with the same tag: $ ('textarea') Using an element next to it: $ ('#neighbor'). prev As a child of its parent: $ ('#frmid'). children ('form') As a form element, using name: $ ('#frmid [name="txtname"]') This example on jsFiddle. The jQuery API reference is an excellent source for documentation.
Here, the list [0..] represents , x^2>3 represents the predicate, and 2*x represents the output expression.. List comprehensions give results in a defined order (unlike the members of sets); and list comprehensions may generate the members of a list in order, rather than produce the entirety of the list thus allowing, for example, the previous Haskell definition of the members of an infinite list.