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A JavaScript array is an object. The dynamic memory allocation operator for & 8230; JavaScript arrays are dynamic: the size of an array can be changed at run & 8230;..1. Overview Differences between JavaScript and Java • Strengths and weaknesses of JavaScript • HTML Basics - Embedding JavaScript in HTML • Versions of JavaScript (their relationship to Browser • versions) 2. Section II - JavaScript Syntax Data types • Literals • Naming conventions and declaring variables • Built-in JavaScript functions (methods) • Expressions and Operators • 3. Methods and Events

The following is the display when the integers 5, 10, and 20 are entered in that order:

15 is the sum of 5 and some other number. The value of input3 is 20 The following script has exactly the same behavior as the previous one. The only difference is that we have moved the last statement in the top-level code so that it occurs after the definition of function f1. This is obviously not good style, but you should be aware of what JavaScript will allow so that you are prepared for cases that might arise when you inadvertently place statements in strange places. (In fact, the function definition could appear anywhere in the script.) < script type = & 8220;text/javascript& 8221; >

var input1 = parseInt( window.prompt( & 8220;Enter an integer& 8221;, & 8220;0& 8243; )), input3; document.writeln( & 8220;< p >& 8221; + f1( input1 ) + & 8221; is the sum of & 8221; + input1 + & 8221; and some other number.< /p >& 8221; ); function f1( i1 ) { var input2 = parseInt( window.prompt( & 8220;Enter another integer& 8221;, & 8220;0& 8243;)); input3 = parseInt( window.prompt( & 8220;Enter a third integer& 8221;, & 8220;0& 8243;)); return i1 + input2; } document.writeln(& 8221;< p >The value of input3 is & 8221; + input3 + & 8220;< /p >& 8221; ); < /script >& 8230; 7.2 JavaScript Arrays A JavaScript array is an object. The dynamic memory allocation operator for instantiating an object is new. The syntax is new Array( size ) where size is a positive integer. The array will have indices from 0 to size-1. One can declare a variable and allocate an array for it in one line var ar = new Array( 10 ); or in two var ar; ar = new Array( 10 ); Where ar is an array, ar.length is the length of ar, that is, one more than its largest index value. There are two ways to initialize an array: One way is to supply a comma-separated list of n arguments to the constructor Array. This creates an array of those n elements, in the order supplied. For example, the following initializes vals to an array containing the the integers 1-5. var vals = new Array(1, 2, 3, 4, 5);

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