J For C Programmers
This book will tell you enough about J for you to use it as a language for developing serious applications, but it is about more than learning the J language: it is also about 'thinking big' in programming, and how programming in J is fundamentally different from programming in C. C programs deal intimately with scalars (single numbers and characters), and even when they combine those scalars into arrays and structures, the operations on the arrays and structures are defined by operations on the scalars. To ensure that each item of an array is operated on, loops are created that visit each element of the array and perform a scalar operation on the element. Writing code in a scalar language makes you rather like a general who gives orders to his troops by visiting each one and whispering in his ear. That touch-of-Harry kind of generalling can achieve victorious results, and it has the advantage that the orders can be tailored to the man, but its disadvantages are significant: the general spends much mental energy in formulating individual orders and much breath in communicating them individually; more significant, his limited attention is drawn.......
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