Search results
Results From The WOW.Com Content Network
Java 8+ stream.reduce (initval, func) stream.reduce (func) JavaScript 1.8 ECMAScript 5 array.reduce (func, initval) [3] array.reduceRight(func,initVal) array.reduce (func) array.reduceRight(func) The reducer main arguments are accumulator and current value, and we can use optional arguments like index and array.
Or, via list comprehension: [x for x in array if pred(x)] Java 8+ stream.filter(pred) JavaScript 1.6 array.filter(pred) Kotlin: array.filter(pred) Mathematica: Select[list, pred] Objective-C (Cocoa in Mac OS X 10.4+) [array filteredArrayUsingPredicate:pred] pred is an NSPredicate object, which may be limited in expressiveness F#, OCaml ...
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)
Starting the summation from the beginning of the array yields: (((((+) +) +) +) +) +) + = Since '+' is both commutative and associative, it is a reduction operator. Therefore this reduction can be performed in parallel using several cores, where each core computes the sum of a subset of the array, and the reduction operator merges the results.
Help; Learn to edit; Community portal; Recent changes; Upload file; Special pages
An Array is a JavaScript object prototyped from the Array constructor specifically designed to store data values indexed by integer keys. Arrays, unlike the basic Object type, are prototyped with methods and properties to aid the programmer in routine tasks (for example, join , slice , and push ).
In array languages, operations are generalized to apply to both scalars and arrays. Thus, a+b expresses the sum of two scalars if a and b are scalars, or the sum of two arrays if they are arrays. An array language simplifies programming but possibly at a cost known as the abstraction penalty.
In computer science, an associative array, map, symbol table, or dictionary is an abstract data type that stores a collection of (key, value) pairs, such that each possible key appears at most once in the collection. In mathematical terms, an associative array is a function with finite domain. [1] It supports 'lookup', 'remove', and 'insert ...