In this chapter, you’ll build more JavaScript programs. You’ll discover that a computer is fundamentally a data processor and that a program tells the computer what to do with the data. You’ll see how programs store data using variables, and you’ll learn how JavaScript manages diverse kinds of data that can be stored by a program. You’ll also learn how JavaScript manages the visibility of variables within a program. By the end of this chapter, you’ll be able to create useful programs.
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