314 Chapter 9 JavaScript: Functions Summary Section 9.1 Introduction · The best way to develop and maintain a large program is to construct it from small, simple pieces, or modules (p. 279). This technique is called divide and conquer (p. 279). Section 9.2 Program Modules in JavaScript · JavaScript programs are written by combining new functions (p. 279) that the programmer writes with "prepackaged" functions and objects available in JavaScript. · The term method (p. 279) implies that the function belongs to a particular object. We refer to functions that belong to a particular JavaScript object as methods; all others are referred to as functions. · JavaScript provides several objects that have a rich collection of methods for performing common mathematical calculations, string manipulations, date and time manipulations, and manipula- tions of collections of data called arrays. These objects make your job easier, because they provide many of the capabilities programmers frequently need. · You can define functions that perform specific tasks and use them at many points in a script. These functions are referred to as programmer-defined functions (p. 279). The actual statements defining the function are written only once and are hidden from other functions. · Functions are invoked (p. 280) by writing the name of the function, followed by a left parenthesis,