CIS 119 Demos part I

arrays demo

Source code:

var a = new Array();
a[0]=7;
a[5]="Dave";
document.writeln('Length of a[] is ' + a.length + '<br />');
for (i=0; i<a.length; i++) {
    document.writeln('a[' + i + '] = ' + a[i] + '<br />');
}

Output:

repetition - for/in demo

Source code:

var b = new Array();
b[0]=7;
b[5]="Dave";
document.writeln('Length of b[] is ' + b.length + '<br />');
for (i in b) {
    document.writeln('b[' + i + '] = ' + b[i] + '<br />');
}

Output:

break and continue demo

Source code:

for (j=1; j<11; j++) {
    if (j==2) continue;
    if (j==5) break;
    document.writeln(j + '<br />');
}

Output:

labeled break and continue demo

Source code:

outerloop:
    for (i=0; i<5; i++) {
    innerloop:
        for (j=0; j<5; j++) {
            if (i==3) continue outerloop
            if (j==2) break innerloop;
            document.writeln(i + ', ' + j + '<br />');
        }
    }

Output:

void operator demo

Note: Although this code says it opens a window, it usually opens a new tab in modern browsers.

Source code:

document.writeln(void 7);
<p><a href="javascript: void window.open();">Open a window using void</a></p>

Output:

Open a window using void

empty statement demo

Source code:

for(sum=0, i=1; i<=10; sum+=i++);
document.writeln('The sum of the numbers 1 to 10 is ' + sum + '<br />');

Output: