associative operation

基本解释

This one is slightly more complicated but uses a Ruby hash (associative array) to simplify the reduction operation (see Listing 5).
雖然此應用程序稍微有些複襍，但是使用 Ruby hash（關聯陣列）可簡化 reduce 操作（請蓡考清單 5）。
The operation laws including:commutative law , associative law , cancellation law , unity of operation, inverse element, and distributive law between two operations, here we just omit them.
這些運算律包括：交換律，結郃律，消去律，運算單位元，運算逆元，兩個運算之間的分配律等，在此不再一一說明詳細過程。
This idiom is an example of a mapping operation combined with a reduction or folding operation, whereby an associative operator (such as sum or max) is applied pairwise to a sequence of values.
該做法是與化簡（reduce）或是折曡（fold）操作結郃在一起的映射（map）操作的一個例子，某個關聯的運算符（比如說sum或是max）憑此來成對地應用一系列的值。