JavaScript The Complete Reference, 3rd Edition

CHAPTER 4Operators, Expressions, and Statements

This chapter provides an overview of the basic building blocks of every script: operators, expressions, and statements. The data types introduced in the last chapter are used directly as literals or within variables in combination with simple operators, such as addition or subtraction operators, and so on, to create expressions. An expression is a code fragment that can be evaluated to some data type the language supports. For example, 2+2 is an expression with the numeric value 4. Expressions are, in turn, used to form statements —the most basic unit of script execution. The execution of statements is controlled using conditional logic and loops.

For those readers new to programming, after reading ...