1139Chapter 42 .Global Functions and Statements } document.getElementById( display ).innerHTML = tableData }

The const keyword

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The const keyword likely will be adopted in the next version of the ECMA-262 standard and will become part of the JavaScript vernacular in future browsers. var NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . . Before using any variable, you should declare it (and optionally initialize it with a value) via the varstatement. If you omit the varkeyword, the variable is automatically assigned as a global variable within the current document. To keep a variable local to a function, you must declare or initialize the variable with the var keyword inside the function s braces. If you assign no value to a variable, it evaluates to null. Because a JavaScript variable is not limited to one variable type during its lifetime, you don t need to initialize a variable to an empty string or zero unless that initial value helps your scripting. For example, if you initialize a variable as an empty string, you can then use the add-by-value operator (+=) to append string values to that variable in a future statement in the document. To save statement lines, you can declare and/or initialize multiple variables with a single var statement. Separate each varName=valuepair with a comma, as in var name, age, height // declare as null var color= green , temperature=85.6 // initialize Variable names (also known as identifiers) must be one contiguous string of characters, and the first character must be a letter. Many punctuation symbols are also banned, but the underscore character is valid and often is used to separate multiple words in a long variable name. All variable names (like most identifiers in JavaScript) are case-sensitive, so you must name a particular variable identically throughout the variable s scope. var
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