Advanced JavaScript by Chuck Easttom

By Chuck Easttom

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Usage of integer values to represent Boolean values, as in other programming languages, can cause data type confusion and should not be done at all by novice programmers. String Literals String literals are delimited by either single or double quotes. You must terminate the string with the same type of quote you used to open it, so "Hi' is not a legal string in JavaScript. Unlike strings in most programming languages and shells, JavaScript does not distinguish between single and double quotes. They serve exactly the same purposes.

These building blocks are used to construct your JavaScript script. I will explain each of these elements in this chapter. Data Types in JavaScript Variables hold information that usually must be of a specific type. These types are referred to as data types. ) will not let you create a generic variable of an unspecified type. ” Even though you don’t have to use typed variables in JavaScript, many programmers find that using specific data types makes their code more readable, and thus more maintainable.

Figure 2-2. Write It is important to understand the way external scripts are interpreted, because many different rules apply to JavaScript and HTML layout. Just keep in mind that an external script is actually interpreted as if it precedes the local script (enclosed by the tags). js suffix to the MIME type application/x-javascript, which it sends back in the HTTP header. js filename extension to application/x-javascript, Navigator will not properly load the JavaScript file specified by the SRC attribute.

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